bluuebunny/crossref_metadata_2025 huggingface dataset:
Primary Sense: a new population health management tool for general practice
Authors: Davies Deborah
Published: June 2020

Primary Sense is a new data extraction, analysis and reporting tool that the Gold Coast Primary Health Network (GCPHN) has developed to enable practical and effective population health management in general practice and also on a regional level. Once installed, the tool de-identifies data within the practice before running it through various clinical risk algorithms to create practical information that can easily be actioned within the general practice business model in at least two ways. The first is to generate up-to-date reports of patients who are most likely to benefit from specific interventions or occasions of service. The second is to identify potentially serious medication safety issues, alerting clinicians in real time at point of prescribing. Formal live testing of the system was completed in nine practices where 22 managers and nurses and 42 GPs used the tool over a 5-month period in 2019. The live test monitored the use of reports and alerts, and regular feedback from users enabled small but important improvements to the tool. Practice teams successfully used the reports to target specific groups of patients with outstanding care needs or who were at greatest risk of adverse health outcomes. The results of the live test showed that users found Primary Sense to be easy to use and beneficial to general practice. The next phase of this project is now underway to further trial the scalability and change management requirements for full implementation of Primary Sense. As more and more practices adopt the tool, the aggregated data will increasingly help to support population health planning, commissioning of local services, active health surveillance and other related activities.
Low male partner attendance after syphilis screening in pregnant women leads to worse birth outcomes: the Syphilis Treatment of Partners (STOP) randomised control trial
Authors: Parkes-Ratanshi Rosalind , Mbazira Kimeze Joshua , Nakku-Joloba Edith , Hamill Matthew M. , Namawejje Mariam , Kiragga Agnes , Kayogoza Byamugisha Josaphat , Rompalo Anne , Gaydos Charlotte , Manabe Yukari C.
Published: June 2020

Background
Maternal syphilis causes poor birth outcomes, including congenital syphilis. Testing and treatment of partners prevents reinfection, but strategies to improve partner attendance are failing. The aim of this study was to determine the effectiveness of three partner notification strategies. Methods: Pregnant women with a positive point-of-care treponemal test at three antenatal clinics (ANCs) in Kampala, Uganda, were randomised 1:1:1 to receive either notification slips (NS; standard of care), NS and a text messages (SMS) or NS and telephone calls. The primary outcome was the proportion of partners who attended the ANC and were treated for syphilis. Results: Between 2015 and 2016, 17130 pregnant women were screened; 601 (3.5%) had a positive treponemal result, and 442 were enrolled in the study. Only 81 of 442 partners (18.3%; 23/152 (15.1%), 31/144 (21.5%) and 27/146 (18.5%) in the NS only, NS + SMS and NS + telephone call groups respectively) attended an ANC for follow-up; there were no significant differences between the groups. Twelve per cent of women attended the ANC with their male partner, and this proportion increased over time. Partner non-treatment was independently associated with adverse birth outcomes (odds ratio 2.75; 95% confidence interval 2.36–3.21; P < 0.001). Conclusions: Only 18.3% of partners of pregnant women who tested positive for syphilis received treatment. Female partners of non-attendant men had worse birth outcomes. Encouraging men to accompany women to the ANC and testing both may address the urgent need to treat partners of pregnant women in sub-Saharan Africa to reduce poor fetal outcomes.
The development of an improved scat survey method for koalas (Phascolarctos cinereus)
Authors: Jiang Alex , Tribe Andrew , Murray Peter
Published: June 2020

Koala scat surveys are important tools for determining koala presence and distribution in large forested areas where it is impractical to conduct direct observation surveys. However, current scat survey methods are problematic due to lack of either accuracy or feasibility, i.e. they are either biased or very time-consuming in the field. This study aimed to establish a new koala scat survey method with improved accuracy compared with existing methods, and practical in the field. We developed a new Balanced Koala Scat Survey method (BKSS), and evaluated it in the field by analysing scat detectability variations and comparing it with a current survey method, the Spot Assessment Technique (SAT), to determine scat searching accuracy. The results revealed that current methods were biased by assigning consistent searching effort for all trees, because effective searching time to detect the first scat was significantly affected by Koala Activity Level (KAL – the proportion of trees found with scats among all 30 trees in a survey site). Compared with BKSS, SAT tended to yield more false negative outcomes; SAT may miss up to 46% of trees with scats when KAL was low. The application of BKSS is expected to greatly enhance the reliability of koala scat surveys in determining koala distribution and thus improve their conservation management.
Long-term association of a transcription factor with its chromatin binding site can stabilize gene expression and cell fate commitment
Authors: Gurdon J. B. , Javed Khayam , Vodnala Munender , Garrett Nigel
Published: June 2020

Significance

Some kinds of transcription factor proteins are very important in initiating and guiding cell fate differentiation. Overexpression of these factors can force many other kinds of cells to become muscle or nerve. Examples are MyoD for muscle and
Ascl1
for nerve. It is not known how long such a factor must remain bound to its binding site for it to have its function; this could be seconds, minutes, hours, or days. We have developed a procedure to determine the required residence time for the
Ascl1
nerve factor to have its function. This factor remains closely associated with its chromatin binding site for hours or days. This may be a general characteristic of such factors in nondividing (adult) cells.
Joint patronage in translating Chinese literature into English
Authors: Bai Liping
Published: June 2020

There has been a change in the form of patronage in translating Chinese culture/literature into English since the 1990s,
that is, from sole patronage to joint patronage. This article discusses joint patronage in translating Chinese literature from Chinese into
English through the case of the Chinese Literature Overseas Dissemination Project (中國文學海外傳播工程), which is under the joint patronage of Beijing Normal University, the Confucius Institute at University of
Oklahoma, and the University of Oklahoma Press. The goals of this project have been well achieved with the successful launch of the journal
Chinese Literature Today (CLT) and the publication of the CLT book series. The success of this project demonstrates that joint patronage is
an ideal form of translating Chinese literature into English, and the Chinese Literature Overseas Dissemination Project has
set a good example for the introduction of Chinese literature to the Western world.
Reframing news by different agencies
Authors: Zeng Weixin
Published: June 2020

This study aims to investigate how news reports are reframed and how a stance is in turn mediated in the process of translation by news agencies in the Chinese mainland and Taiwan when they cover the same news event. A database is built from 50 reports on the US-China trade dispute, half from Reference News (RN), a news agency based in Chinese mainland and the other half from Liberty Times (LT), a media outlet in Chinese Taiwan, as well as their corresponding source texts from foreign news agencies. The results show that the reframing practices in the two agencies vary from each other in framing the US-China trade dispute and the image of China and America. The overall pattern of stance shift in the translation by RN is towards a pro-China/anti-US direction while in the translation by LT towards a more anti-China/pro-US direction. These might be caused by the political stance of the news agency, the media environment and the relationship with the United States.
The construction of a Practice-Teaching-Research (PTR) model for the accomplishments of college interpreting teachers in
China
Authors: Kang Zhifeng , Shi Ying
Published: June 2020

This article focuses on the issues of unclear self-positioning, vague objectives and unbalanced factors among the
interpreting practice (IP), interpreting teaching (IT) and interpreting research (IR) of interpreting teachers in Chinese colleges. Based on
the research thread of diachronic and synchronic development in the accomplishments of college interpreting teachers’ in China, and the
approach to analysing the three dimensions of practice, teaching and research, this study investigates interpreting teachers at five
universities in Shanghai. Based on the investigation in Shanghai, this study puts forward a Practice-Teaching-Research (PTR) model as
a three-in-one approach to cultivating comprehensive interpreting teachers’ positioning and strategies in the transition period. It
constructs Overall Interpreting (OI) = Interpreting Practice (IP) + Interpreting Teaching (IT) + Interpreting Research (IR), OI=IP+IT+IR as
the formula, which is the realization of constructing a PTR model as a three-in-one approach for college interpreting teachers in China.
This study has a certain guiding significance in the new era for setting up college interpreting teacher teams and improving their
accomplishments in China.
Women’s Marital Surname Change by Bride’s Age and Jurisdiction of Residence: A Replication
Authors: MacEacheron Melanie
Published: June 2020

Hyphenating or keeping premarital surname for all U.S. destination brides marrying in Hawai’i in 2010 was highly, positively correlated with a state-level women’s income measure (r = .78, p < .000) and the analogous statistic for men (r = .64, p < .000), by bride’s state of residence. The women’s measure, only, remained significant when both predictors were used, together, to predict retention/hyphenation (i.e., under regression of both predictors). The interaction of state Gini coefficient and the women’s income measure was positively predictive in a regression including the interaction components as predictors (adjusted-R2
= .66). None of several other predictors suggested by previous research or related to Gini index or income, testable using available, state-level data, were predictive (under regression) alongside the women’s income measure. The older the bride, from any jurisdiction, the more likely she is to hyphenate or keep her surname (χ2 for linear trend = 1754.65, p < .000). These analyses comprise a nearly direct replication of previous work, adding novel analyses. Taken together, the original and replicated study may show evidence consistent with a general practice of women taking into account local economic factors, in marital surname decision-making.
Sparse dynamic tomography: a shearlet-based approach for iodine perfusion in plant stems
Authors: Bubba Tatiana A , Heikkilä Tommi , Help Hanna , Huotari Simo , Salmon Yann , Siltanen Samuli
Published: June 2020

In this paper we propose a motion-aware variational approach to reconstruct moving objects from sparse dynamic data. The motivation of this work stems from x-ray imaging of plants perfused with a liquid contrast agent, aimed at increasing the contrast of the images and studying the phloem transport in plants over time. The key idea of our approach is to deploy 3D shearlets as a space-temporal prior, treating time as the third dimension. The rationale behind this model is that a continuous evolution of a cartoon-like object is well suited for the use of 3D shearlets. We provide a basic mathematical analysis of the variational model for the image reconstruction. The numerical minimization is carried out with primal-dual scheme coupled with an automated choice of the regularization parameter. We test our model on different measurement setups: a simulated phantom especially designed to resemble a plant stem, with spreading points to simulate a spreading contrast agent; a measured agarose gel phantom to demonstrate iodide diffusion and geometry prior to imaging living sample; a measured living tree grown in vitro and perfused with a liquid sugar–iodine-mix. The results, compared against a 2D static model, show that our approach provides reconstructions that capture well the time dynamic of the contrast agent onset and are encouraging to develop microCT as a tool to study phloem transport using iodine tracer.
Composition dependence of the superconducting properties of UTe2
Authors: Cairns Luke Pritchard , Stevens Callum R , O’Neill Christopher D , Huxley Andrew
Published: June 2020

A better understanding of the synthesis conditions, composition and physical properties of UTe2 are required to interpret previously reported unconventional superconductivity. Here we report how the superconducting properties of single crystals depend on the ratio of elements present in their synthesis by chemical vapour transport. We have obtained crystals with the highest reported ambient pressure T
c and a larger superconducting heat capacity jump from a growth with a U:Te ratio different from that widely used in the literature. For these crystals, the ratio of residual heat capacity in the superconducting state to that of the normal state, γ*/γ
N, is significantly lower than 0.5, reported elsewhere. An upturn in the heat capacity below 200 mK is also reduced compared to other studies and is well described by a Schottky anomaly and residual Sommerfeld term rather than quantum critical behaviour.
Characterization of electric discharge collocated with gas jet in supersonic airflow
Authors: Efimov A V , Firsov A A , Kolosov N S , Leonov S B
Published: June 2020

The subject of this paper is a constricted electric discharge, generated over a mixing layer of ethylene (as a generic fuel) and carbon dioxide (as a product of combustion) directly injected into a supersonic airflow. The discharge location and plasma parameters are characterized based on optical spectral analysis, fast camera observation, and electrical probe measurements. It is shown that the discharge mostly locates within a zone of gas composition relevant to the mixing layer and drifts toward the core airflow in the case of carbon dioxide or stay in the area rich by secondary gas in the case of ethylene injection. The analysis of the experimental data demonstrates that the discharge behaviour is determined by the balance of thermal dissociation, dissociative thermal conduction and nonequilibrium ionization.
Non-adiabatic transitions in the near-UV photodissociation of

H3+
Authors: Urbain X , Dochain A , Marion R , Launoy T , Loreau J
Published: June 2020

Synopsis

The near-UV photodissociation of

H
3
+

has been studied in a fast beam experiment. The kinetic energy release and branching ratio among the fragmentation channels were obtained by three-dimensional imaging of the dissociation products. It is found that the photodissociation of vibrationally excited

H
3
+

mostly produces vibrationally cold

H
2
+

and hot H2. The non-adiabatic repopulation of the ground potential energy surface after excitation is accounted for by modelling the wavepacket dynamics on the intersecting potential energy surfaces.
Phase sensitive coherent control excitation schemes applied to photoionization microscopy of the hydrogen atom
Authors: Kalaitzis P , Danakas S , Ferentinou K , Lépine F , Bordas C , Cohen S
Published: June 2020

Synopsis

Photoionization microscopy (PM) is employed for imaging the flux of slow (meV) electrons ejected via atomic photoionization in the presence of a static electric field. Just above the ionization limit continuum and quasi-disrete states are degenerate. In hydrogen atom resonant excitation dominates over the continuum one, while the reverse holds for more complex atoms. We demonstrate theoretically that by using a bichromatic ω/2ω laser field and by applying phase sensitive coherent control techniques it is possible to unbury and isolate other-wise obscured resonant features in PM images.
Coherent control schemes for the photoionization of helium in the extreme ultraviolet spectral region
Authors: Liu C-N , Morishita T
Published: June 2020

Synopsis

We present a theoretical study for coherent control based on resonant excitation to doubly excited states of helium. Bichromatic schemes are designed, using XUV light from the seeded free-electron laser FERMI, where the phase of the third harmonic relative to the fundamental can be controlled. In addition to demonstrate the interference effects, we provide detailed theoretical analyses to identify the FEL parameters, such as intensities and pulse durations, needed for experimentally observable coherent control of the photoionization yields.
Attosecond delays in photoionization studied with coherent-controlled FEL
Authors: You D , Ueda K , Tugs O , Orimo Y , Sato T , Ishikawa K L , Gryzlova E V , Staroselskaya E I , Grum-Grzhimailo A N , Carpeggiani P A , Csizmadia T , Füle M , Harshitha N G , Sansone G , Maroju P K , Meyer M , Mazza T , D’Elia A , Callegari C , Di Fraia M , Plekan O , Giannessi L , Allaria E M , De Ninno G , Trovò M , Badano L , Diviacco B , Gauthier D , Mirian N S , Penco G M , Rebernik P R , Spampinati S , Spezzani C , Gaio G , Prince K C
Published: June 2020

Synopsis

When an electron is ejected from an atom after absorption of a photon, the photoelectron wave packet has an extremely short group delay between the photon absorption and the electron emission. This interval, called the Eisenbud-Wigner-Smith delay, is on the order of a few attoseconds. Here, we present a new method to measure the photoemission delay, using coherent-controlled free-electron laser pulses.
Time-resolved dynamics of thiophene dication – probing parent molecule survival times and multi-step dissociation processes of cyclic molecules by free-electron-laser experiments combined with theoretical simulations
Authors: Kukk E , Fukuzawa H , Nagaya K , Niskanen J , Luo Y , Peschel J , Kooser K , Itl E , Pelimanni E , Saito S , You D , Maclot S , Nizou A , Ha D T , Myllynen H , Ueda K
Published: June 2020

Synopsis

Thiophene is a cyclic molecule that becomes unstable as a molecular dication. We followed the multi-step dissociation dynamics triggered by soft x-ray FEL pulses from SACLA, core-ionizing the S 2p orbital and creating parent dications by the Auger decay. The time-evolution was probed by optical laser pulsesthat reveal the survival lifetime of the parent dication and the build-up of fragmentation proceeding by ring opening and rupture, accompanied by hydrogen ejection and secondary dissociation. Experimental results are compared to statistical analysis of molecular dynamics simulations.
Ion-ion collision-induced evaporative cooling of atomic and molecular ions by autoresonance in an electrostatic ion beam trap
Authors: Heber O , Gangwar R K , Saha K , Rappaport M L , Zajfman D
Published: June 2020

Synopsis

A new method for cooling beams of any ion is introduced. The method is autoresonance acceleration of ions inside an Electrostatic Ion Beam Trap. Intrabunch collisions of trapped (molecular) ions transfer energy from the “cold” part of the population of the ion distribution to the “hot” part, which, in turn, evaporates from the bunch. As a result, bunches of ions were cooled from about 45 K to well below 1 K.
Photodetachment of negative ion beams for the ion-neutral merged-beam experiments at RICE
Authors: Iizawa M , Iida S , Kuma S , Azuma T , Nakano Y
Published: June 2020

Synopsis

Generation of neutral atomic beam is under development for the ion-neutral merged-beam experiment at the RIKEN Cryogenic Electrostatic ion storage ring (RICE). The beam is produced by a photodetachment of a negative ion beam using a high power laser diode array with a wavelength of 808 nm. In order to increase the detachment efficiency, we have developed an optical cavity built with a planar mirror. In this presentation we will present the current status of the neutral atom beam source.
Reaction Microscope experiments with shaped laser pulses
Authors: Farfán D Martínez , Fross P , Kerbstadt S , Mi Y , Camus N , Sun X , Wollenhaupt M , Pfeifer T , Moshammer R
Published: June 2020

Synopsis

Using a 4f pulse shaper in combination with a Reaction Microscope we performed 800 nm pump-probe experiments with orthogonally polarized pulses on H₂.
On how classical uncertainties might affect the coherence properties of collisions processes, and how to control them
Authors: Barrachina R O , Navarrete F , Ciappina M F
Published: June 2020

Synopsis

In principle, the quantum coherence properties of any collision experiment should be affected by unavoidable classical uncertainties. However, they seem to produce no observable effect. This mystery can be solved by introducing the concept of “coherence length” which, in addition, provides a way to control and modify the aforementioned quantum properties. Finally, we discuss different methods to achieve a transition between coherent and incoherent collisions, evaluating their strengths and weaknesses.
Approaches for constraining uncertainty and degeneracy in geometry reconstruction of molecules from Coulomb Explosion Imaging data
Authors: Tian K , Ramadhan A , Singh M D , Sanderson J
Published: June 2020

Synopsis

Starting with simulated OCS molecular data we use two methods to propose a framework for reconstructing geometries, using Coulomb explosion imaging (CEI), for use in the production of molecular movies. The first method is a lookup table, which helps us investigate the existence and nature of multiple solutions to the geometry reconstruction problem and define regions of degeneracy in molecular structure. The second is a new method using nonlinear constrained optimization. We also use this method to investigate the uncertainty in geometry reconstructions as a function of measurement error.
K-shell electron-impact excitation and polarization of x-ray emission of Fe20+ ion
Authors: Zhang J M , Xie L Y , Zhang D H , Jiang J , Wu Z W , Dong C Z
Published: June 2020

Synopsis

The total and magnetic cross sections for K-shell electron impact excitation (EIE) of Fe20+ have been calculated using the fully relativistic distorted-wave approach. Degrees of linear polarization of x-ray emission following EIE are presented for several stronger 2p→1s transitions, and compared with the values for the same transition lines but from dielectronic recombination process of Fe21+ in the ground state, obvious differences are found that can be employed in diagnosing the formation mechanism of corresponding x-ray lines.
Bayesian atomic structure calculations for collisional problems
Authors: Mendez AMP , Filippo J I Di , Lopez S D , Mitnik D M
Published: June 2020

Synopsis

The calculations of collisional processes require an accurate description of the target. In general, the atomic structure is obtained through tedious iterations in which a variety of configurations and parameters are chosen to minimize the differences between the numerical and experimental values of the energies and the oscillator strengths. Using a Bayesian machine learning analysis through a Tree–structured Parzen Estimator, we can reproduce the experimental atomic structure with high accuracy. Results for neutral beryllium are presented.
Integral cross sections of the valence-shell excitations of carbonyl sulphide studied by the high-energy electron scattering
Authors: Liu Y-W , Du X-J , Xu Y-C , Zhu L-F
Published: June 2020

Synopsis

The integral cross sections (ICSs) of the valence-shell excitations of carbonyl sulphide have significant applications in the astronomical observation. Based on the generalized oscillator strengths (GOSs) of these excitations measured by the high-energy electron scattering, the ICSs of the valence-shell excitations of OCS have been determined in a wide energy region from the threshold to 5 keV with the aid of the BE-scaling method.
Resolving and imaging the stereo-configuration of OCS dimers in gas phase
Authors: Yu X , Li X , Yin Z , Wang C , Luo S , Ding D
Published: June 2020

Synopsis

Polar, non-polar and cross-shaped isomers of OCS dimer are observed and the corresponding structures are resolved using fs laser-induced Coulomb explosion. These three structures are confirmed in the simulations, and demonstrate that the dimer structures can be reconstructed from the measured momenta distributions. Our study will promote the real time imaging the evolution of molecular dimer at fs time scale after excitation and ionization.
Ab initio quantum calculations of collisional effects in molecular spectra
Authors: Jóźwiak H , Thibault F , Stolarczyk N , Wcisńo P
Published: June 2020

Synopsis

We present the methodology of obtaining the dataset of the beyond-Voigt line-shape parameters for spectroscopic databases from fully ab initio quantum-scattering calculations. It provides not only the pressure broadening and shift coefficients, but also their speed dependencies and the complex Dicke parameter. This approach is based on the calculations of the generalized spectroscopic cross section, resulting from the close-coupling equations solved for a given scattering system. The calculations were validated on accurate experimental spectra of the helium-perturbed hydrogen molecule.
Jahn-Teller effect on the 1t2 orbital electron momentum distribution of Methane
Authors: Niu S S , Shan X , Tang Y G , Liu Z H , Chen X J
Published: June 2020

Synopsis

We report an experimental study about the Jahn-Teller effect resulted from the ionization of the high-est occupied molecular orbital (HOMO) 1t2 of methane. The difference of the electron momentum distributions for the Jahn-Teller splitting components reveals the strong interaction between electronic and nuclear vibrational motion.
Momentum transfer dependence behavior of the 3 s-1nl autoionization states of argon studied by high-resolution fast electron impact
Authors: Zhu L-F , Du X-J , Liu Y.-W.
Published: June 2020

Synopsis

Momentum transfer dependence behavior of the autoionization states plays an unique role in understanding the electronic correlation effect. In the present work, the 3s-1nl autoionization states and their peak profiles of argon have been measured at different scattering angles by fast electron impact. The momentum transfer dependence behaviors of the dipole-allowed and dipole-forbidden autoionization states of argon have been elaborated.
Quenching of interstellar carbenes: Interaction of C3H2 with He and H2
Authors: Ben Khalifa M , Sahnoun E , Wiesenfeld L , Khadri F , Hammami K , Dulieu O
Published: June 2020

Synopsis

C3H2 molecules are ubiquitous in the Galaxy and present important challenges in their chemistry, whether cyclic or linear, and possibly substituted with D. Obtaining theoretical rotational quenching rates by collisions with He and H2 as projectiles is of great importance in order to get quantitative abundance estimates. It is all the more challenging that many rotational lines are excited during the collision, resulting in computationnally very heavy quantum dynamics. The quality of various approximations will be discussed, as well as the quenching rates for astrophysical applications.
Study of electron impact fine-structure excitation and polarization of highly charged tungsten ions
Authors: Shukla N , Shrivastava R
Published: June 2020

Synopsis

Study of electron-impact excitation of few highly charged tungsten ions viz. Tm-, Er- and Ho-like has been done using relativistic distorted wave theory (RDW). The dipole allowed transitions of these ions are considered and electron-impact excitation cross section are reported in the wide range of energy. These calculated cross section are also fitted with suitable analytical expressions for the direct use in plasma modelling. Further-more, the polarization of the emitted photons on consequent decay of the excited tungsten ions are calculated by utilizing density matrix theory.
To disentangle strong resonant Auger decay lines after the

O1s→3σu*

excitation in O2 molecules
Authors: Ding B , Xu W Q , Nicolas C , Song S , Jiang Y , Patanen M , Nandi S , Xiao Z , Miron C , Liu X J
Published: June 2020

Synopsis

Atomic features may appear in the Auger electron spectra after an electron is excited from a core orbital to an antibonding orbital in molecules, as a result of complex competitions among electron and nuclear motions. Relatively weak atomic features were widely discussed in spectator Auger decay processes on top of

O
1
s
→
3

σ
u
*

excitation in O2 molecules. Thee strong Auger decay processes are heavily-overlapped in the electron spectrum and not discussed up to now. Here, using multi-particle coincidence setup, we separate these Auger decay processes for the first time.
Electron-impact ionization cross section calculations for selected ribonucleosides
Authors: Możejko P
Published: June 2020

Synopsis

Total cross sections for the single electron-impact ionization of selected ribonuclosides (guanosine, adenosine, cytidine and uridine) have been calculated for electron energies ranging from the ionization threshold up to 5 keV.
Auger-like correlations in the two-photon above threshold ionization of atoms and molecules in the vicinity of the giant resonance
Authors: Lagutin B M , Petrov I D , Novikovskiy N M , Sukhorukov V L , Demekhin Ph V , Ehresmann A
Published: June 2020

Synopsis

The two-photon ionization of the Ne–CH4 and Ar–SH4 isoelectronic systems was studied theoretically for the photon energies exceeding the ionization threshold of the outer shells. The calculations demonstrate that the two-photon ionization of the investigated objects is almost entirely a collective process if the one-photon energy corresponds to the energy of the

n
ℓ
→
ε

ℓ
R
′

giant resonance. The largest contribution to the transition (2) amplitude stems from the Auger-like correlation

n

ℓ
2

→

(
2
)

ε

ℓ
R

′
2

⇒
n
ℓ

ε
″

ℓ
″

.
Multi-electron/ion coincidence spectroscopy in Xe triple ionization
Authors: Khalal M A , Palaudoux J , Lablanquie P , Andric L , Zitnik M , Bucar K , Bizau J-M , Cubaynes D , Penent F
Published: June 2020

Synopsis

The study of atomic multiple photoionization by a single photon can be performed by detecting in coincidence all the corresponding electrons with a magnetic bottle time of flight spectrometer. To reveal minor triple ionization channels of Xe atom that are hindered by radom coincidences, we have detected three electrons in coincidence with the corresponding Xe3+ ion, thanks to a new permanent magnet design using a drilled soft iron pole.
Inner-shell ionization of W25+
Authors: Pakalka S , Kynienė A , Jonauskas V
Published: June 2020

Synopsis

Inner-shell ionization by electron impact is investigated for the W25+ ion. Decay of inner-shell vacancy through Auger transitions is analyzed. Contribution of direct ionization process to double and triple ionization is presented.
Strong bond rearrangement and hydrogen-pair emission in linear geometry following water ionization by electron impact
Authors: Ferreira N , Sigaud L , Montenegro E C
Published: June 2020

Synopsis

The H0 + O+ + H0 fragmentation of water by electron impact is studied using the delayed extraction time-of-flight technique to uncover kinematic attributes of suprathermal O+ ions. It is found that the H0 pair ejections occur under a large angular rearrangement, in an approximate linear geometry, and leaving the O+ near at rest, with ∼50% of the O+ produced in water fragmentation by swift electrons presenting this feature. It is shown that this behavior is closely associated to the excitation of satellites one-electron-two-vacancies states near the 2a1 orbital.
Electron-impact ionization of Fe3+
Authors: Kynienė A , Kučas S , Masys Š , Pakalka S , Jonauskas V
Published: June 2020

Synopsis

Electron-impact ionization cross sections are studied for levels of the ground and first excited con-figurations of the Fe3+ ion. Convergence for the excitation-autoionization cross sections due to excitations to the high-nl shells is investigated. Single configuration and configuration interaction methods are used in the study. Scaling is applied to the distorted wave cross sections of the excitation-autoionization and collisional ionization processes.
Revisit of (e,2e) & (e,3e) processes on atoms with twisted electron impact
Authors: Dhankhar N , Mandal A , Sebilleau D , Choubisat R
Published: June 2020

Synopsis

We compute Triple Differential Cross Section (TDCS) and Five-fold Differential Cross Section (FDCS) for (e,2e) & (e,3e) processes on atoms respectively to investigate the effects of non zero angular momentum and the apex angle of the twisted electron. We observed that the differential coincidence cross sections largely depend on these parameters.
The role of multiple ionization in fast highly charged ions collisions on H2O
Authors: Bachi N , Otero G S , Otranto S , Olson R E
Published: June 2020

Synopsis

An adaptive classical trajectory Monte Carlo model that explicitly considers the eight electrons cor-responding to the valence molecular orbitals of the H2O molecule is introduced. In this dynamical model, the electrons’ binding energies change throughout the collision ensuring the proper energy deposition by the projectile for multiple electron removal. Present results are relevant to the ion-therapy program, specially at irradiation planning stages in which detailed information on the electronic emission spectra are needed as input data.
Photoionization of the open-shell nitrogen atom confined in C60
Authors: Gorczyca T W , Manson S T
Published: June 2020

Synopsis

Endofullerene photoionization of open-shell N@C60 is investigated using a coupled-channel, correlated R-matrix approach with additional modifications for a finite spherical-shell fullerene potential. Particular focus is on the initial-state dependence of the photoionization cross section. Comparisons show significant differences between the 1s
22s
22p
3(4S) initial state and the metastable 2D and 2P states, as well as strong confinement oscillatory structure.
Plasmon assisted isomerization in naphthalene and azulene
Authors: Vinitha M V , Najeeb P K , Kala A , Bhatt P , Safvan C P , Vig S , Kadhane U
Published: June 2020

Synopsis

Plasmon excitation in polycyclic aromatic hydrocarbons is a dominant excitation mode in fast charged particle collisions. Excitations of this nature lead to several secondary processes like ejection of neutral atomic or molecular fragments. The present work explores the influence of plasmon excitation on isomerization on two small size PAHs namely, naphthalene and azulene. Moreover, the existence of double plasmon excitation is demonstrated with the help of experimental observations of dication dissociation and plasmon excitation model calculations.
Absolute total cross sections of multiple electron processes for molecules of biological interest by fast proton impact
Authors: Terekhin P N , Quinto M A , Monti J M , Fojón O A , Rivarola R D
Published: June 2020

Synopsis

We present the study of multiple electron processes produced by impact of proton beams on molecular targets from intermediate to high projectile impact energies. Transition probabilities and absolute cross sections were determined by using the Continuum Distorted Wave-Eikonal Initial State approximation. Results were compared with previous calculations and also with recent experimental data.
Experimental investigation of dissociative ionization of NeAr dimer by electron impact
Authors: Yan S , Ma X , Zhu X L , Zhang S F , Zhao D M
Published: June 2020

Synopsis

A two body fragmentation experiment of NeAr dimer by 480 eV electron impact was performed. By recon-structing the momenta of Ne+ ion, Ar+ ion and one electron, the 2D coincidence map between Kinetic energy release and electron energy is obtained, from which two islands are observed. It is found that, Interatomic Coulombic Decays induced by Ne+Ar ion and Ar+ Ne ion can both take place in our experiment, as well as Radiative Charge Transfer. This is different from X ray in which only one decay process is dominant in one incident energy.
Target sensitivity of photoelectron holograms
Authors: Borbély S , Tóth A , Zs Kiss G , Nagy L
Published: June 2020

Synopsis

Photoelectron holograms appear as a modulation in the momentum distribution of the photoelectrons created during the ionization of atomic and molecular targets by few-cycle laser pulses, and it is the direct result of the continuum electonic wave packet scattering on the target. Using first principle calculations we show that the pattern of the formed photoelectron hologram is strongly influenced by the shape of the target’s binding potential.
Shrinking diffraction “fringes” in positronium formation from C60 to C240
Authors: Hervieux P –A , Chakraborty A R , Chakraborty H S
Published: June 2020

Synopsis

Due to the bulk electron capture from the molecular shell of fullerenes by incoming positron projectiles and a dephasing effect across the shell width, the positronium formation signal yields diffraction fringes in the target recoil momentum space. Our results show the variance in the separation and shape of the fringe pattern as a function of the fullerene size from C60 to larger C240.
State-selective single electron capture in slow O
6+-He collisions
Authors: Xu J W , Zhu X L , Feng W T , Zhao D M , Zhang S F , Guo D L , Gao Y , Ma X
Published: June 2020

Synopsis

The state-selective single-electron capture processes were measured by cold-target recoil-ion momentum spectroscopy in O
6+-He collisions between 18keV and 96keV. From the longitudinal momentum spectrum of recoil ions, the single electron captured into n=3 states of projectile ion is predominant and n=4 states have a small contribution. The oscillation structure of angular differential cross sections was observed. The present experimental results are compared with other experiments at low energy and the predictions of the molecular Columbic barrier model.
Low energy fragments from O2+ + H2 collisions following single and double electron removal from the target
Authors: Juhász Z , Vizcaino V , Chesnel J-Y , Kovács STS , Herczku P , Demes S , Rácz R , Biri S , Sulik B
Published: June 2020

Synopsis

Fragmentation of H2 by 20-keV O2+ was studied. A time of flight setup was developed to measure the low-energy fragment ions originating from singly ionized target molecules. High-energy fragments stemming from double electron removal were measured by an electrostatic spectrometer. The contribution of the low-energy fragments is significant but smaller than that of the energetic ones. Though single electron removal is more probable it less likely leads to dissociation. A statistical type model shows a good agreement with the experimental results.
Convergent close-coupling approach to proton collisions with helium
Authors: Alladustov S U , Abdurakhmanov I B , Kadyrov A S , Bray I , Bartschat K
Published: June 2020

Synopsis

We develop a two-center wave-packet convergent close-coupling approach to proton collisions with helium including electron exchange. The convergence of the final results is studied in terms of the included projectile- and target-centered pseudostates. We present electron-capture and single- and double-ionisation cross sections in the projectile energy range from 15 keV to 1 MeV. We also provide partial cross sections for electron capture and direct excitation into the n = 2 shell states of hydrogen and helium, where n is the principal quantum number of the final state. Our results are in good agreement with available experimental data and other calculations.
Charge exchange UV-Visible and EUV spectroscopy of multiply charged heavy ions
Authors: Numadate N , Yamada Y , Ohna T , Tanuma H
Published: June 2020

Synopsis

To provide spectroscopic data of multiply charged heavy ions related not only the development of EUV light and soft X-ray sources and also optical measurements of neutron star mergers, charge exchange spectroscopy was performed using an ECR ion source with two spectrometers in EUV and UV-Visible regions.
Jahn-Teller effect among electronic resonant states of H3
Authors: Hedvall P , Larson
Published: June 2020

Synopsis

The Jahn-Teller conical intersection among the electronic resonant states of H3 is studied. We have performed electron scattering calculations and obtained complex adiabatic potential energy surfaces that we describe using a generalized Jahn-Teller Hamiltonian. The non-adiabatic coupling and the geometric phase were also investigated.
A study of the critical minima and spin polarization in the e-Sr elastic scattering
Authors: Abdullah M N A , Haque A K F , Kumar A , Uddin M A
Published: June 2020

Synopsis

A complex optical potential (OP) is employed within the framework of the Dirac partial wave method to study the critical minima (CM) in the differential cross sections and the spin polarization for the elastic scattering of electrons by the Sr atom in the energy range Ei
= 1-1000 eV. The complex optical potential is composed of the static, exchange, polarization and absorption potentials. The number of CM points has been found to be 7 in the DCSs of e-Sr scattering, while the number of maximum spin polarization points observed is 13.
Low energy electron mass stopping power in H2
Authors: Zawadzki M , Khakoo M A
Published: June 2020

Synopsis

We present experimental mass stopping powers of electrons in gaseous H2 obtained with a newly developed electron time-of-flight spectrometer, for the incident electron energy range of 10 eV to 25 eV. In our procedure the average energy loss is derived from our conversion of measured electron time-of-flight spectra into equivalent electron energy loss spectra so as to obtain the values of mass stopping power for electron scattering from H2.
Electron driven scattering studies involving diborane
Authors: Yadav H , Prajapati D , Vinodkumar M , Vinodkumar P C
Published: June 2020

Synopsis

In the present case we study the electron impact scattering cross sections on diborane (B2H6
) for the energy range 0.1 eV to 5000 eV. The present study provides differential cross sections (DCS), momentum transfer cross sections (MTCS), ionization cross sections and total scattering cross sections (TCS). The experimental determinations of these cross sections are rather difficult dur to its complex structure and stability. These cross sections are important in many applied fields.
EUV spectroscopy of Kr, Y and Mo ions using CoBITs
Authors: Sokell E , Ali S , Kondo T , Monobe M , Ohishi S , Sakaue H A , Nakamura N
Published: June 2020

Synopsis

CoBITs have been used to produce Kr, Y and Mo ions and EUV spectra have been recorded. The data indicate that the CoBIT spectra are significantly different to laser-produced plasma emission spectra for similar ion stages. This difference is attributed to the different number density of electrons in the two kinds of plasmas. The evolution of the line profiles with electron beam energy for a number of different ions has been studied.
Electron capture to the Rydberg atomic states in ternary collisions with neutral particles
Authors: Narits A A , Kislov K S , Lebedev V S
Published: June 2020

Synopsis

We report on the results of theoretical comparative studies of different physical mechanisms of free electron capture to the Rydberg atomic states and bound-bound transitions in discharge plasmas of Ne/Xe and Ar/Xe mixtures containing atomic and molecular ions. Particular attention is paid to the role to the resonant non-adiabatic free-bound and bound-bound transitions due to collisions with neutral particles. We show that in a wide range of low-temperature plasma parameters the contribution of resonant processes to the population of low-lying Rydberg states is predominant.
Response of nonequilibrium nonstationary plasma created by intense femtosecond UV laser pulse in rare gases: emission in the THz frequency band
Authors: Bogatskaya A V , Popov A M
Published: June 2020

Synopsis

We analyse the response of the current in plasma created in the process of gas ionization by an intense UV laser pulse in the terahertz frequency band. Our consideration allows us to take into account both temporal retardation of the EVDF evolution with respect to the external electric field and the effect of the relaxation of the strongly nonequilibrium EVDF due to elastic electron - atomic collisions The suggested theory enables to properly describe propagation of short and ultra-short THz pulses in laser plasma waveguides.
Electron density diagnosis of laser-produced plasmas based on spectral line broadening of highly charged ions
Authors: Wang K P , Su M G , Cao S Q , Ma P P , Sun D X , Min Q , Dong C Z
Published: June 2020

Synopsis

Spectral line profile of Ti XII 11.64 nm was measured using spatio-temporally resolved laser-produced plasma technique. The electron density of laser-produced Ti plasmas was calculated based on the spectral line Stark broadening of highly charged ions.
On the probability of close collisions of charged particles with atoms in a crystal
Authors: Kyryllin I V , Shul’ga N F
Published: June 2020

Synopsis

An investigation on the probability of close collisions of fast charged particles with atoms in a straight and bent crystal was carried out. On the basis of analytical calculation and numerical simulation we analyzed the dependence of this probability from the orientation of the crystal with respect to the direction of fast charged particles motion.
Effect of secondary electron emission on the guiding properties of insulating capillaries
Authors: Giglio E , Tökési K , Dubois R D
Published: June 2020

Synopsis

The transmission of 1 keV Ar+ ions through a macroscopic glass capillary is simulated by taking explicitly into account the secondary electron (SE) emission generated by ion impacts inside the capillary. The SE emission re-distributes the injected charge in the capillary wall and thus modifies the guiding power of insulating capillaries. Especially for high beam intensities, SE are found to be crucial for explaining the observed time-evolution of the transmitted intensities.
Coherent effect in ionization loss of relativistic electron ensembles in ultrathin targets
Authors: Trofymenko S V , Shul’ga N F
Published: June 2020

Synopsis

Ionization loss of relativistic electron bunches in ultrathin targets is considered. It is shown that the effect of coherent amplification of ionization loss comparing to Bethe-Bloch result, analogous to such effect in radiation, can take place for sufficiently small bunches with high particle densities. It is demonstrated that such effect can manifest itself for bunch parameters achievable on modern accelerator facilities.
Formation of nanocraters on the surface of gold nanolayer by an impact of highly charged xenon ions
Authors: Stabrawa I , Banaś D , Kubala-Kukuś A , Jabłoński Ł , Jagodziński P , Sobota D , Szary K , Pajek M , Mendyk E , Skrzypiec K , Borysiewicz M
Published: June 2020

Synopsis

In this work we have systematically studied process of energy deposition and formation of nanostructures on metallic (Au nanolayer) surfaces as a result of the irradiation with slow highly charged xenon ions (HCI). Well pronounced modifications of the surfaces in form of craters were observed. We found that, in the systems considered, the kinetic energy influences the crater depth, while the potential energy affects the crater size at the surface. This finding showed that for gold nanolayers the potential energy plays important role in the nanostructures creation.
Revision of optical property of silicon by a reverse Monte Carlo analysis of reflection electron energy loss spectroscopy spectra
Authors: Yang L H , Tőkési K , Tóth J , Da B , Ding Z J
Published: June 2020

Synopsis

The energy loss function (ELF) of silicon in a wide photon energy region (0-200 eV) was derived from reflection electron energy loss spectroscopy spectra with a theoretical analysis of the measured data. The accuracy of our result was justified by using the f- and ps-sum rules. Based on the new ELF, individual contributions of surface excitation and the bulk excitation to the REELS spectrum have been separated, and multi-scattering effect in the reflection electron energy loss spectroscopy spectrum has been studied in detail.