bluuebunny/crossref_metadata_2025_split huggingface dataset:
Mutual Neutralization in Cl− + C+ Collisions
Authors: Hedvall P , Larson  , Orel A E 
Published: June 2020

Synopsis
The mutual neutralization reaction of Cl− + C+ → Cl + C is studied from first principles. The cross section and the thermal rate coefficient are calculated for low collision energies, and the effect of spin-orbit coupling is estimated using a semi-empirical method. Recent experiment has measured a thermal rate coefficient [1], which allows for a comparison between theoretical and experimental studies of the reaction.
Ionization of large helium nanodroplets
Authors: Lundberg L , Laimer F , Martini P , Kranabetter L , Tiefenthaler L , Albertini S , Zappa F , Gatchell M , Scheier P 
Published: June 2020

Synopsis
We have produced and mass-selected large, highly charged helium droplets containing up to 1010 He atoms and several tens of charges. They are stable with both multiple positive and negative charge carriers and are stabilized by losing small fragments of excess charge instead of disintegrating (highly asymmetric fission).
Oscillator strengths and integral cross sections of the valence-shell excitations of HCl studied by fast electron scattering
Authors: Xu Y-C , Du X-J , Liu Y-W , Zhu L-F 
Published: June 2020

Synopsis
Oscillator strengths and integral cross sections (ICSs) of HCl are of great importance for the understanding of many different aspects of atmospheric physics. Based on the generalized oscillator strengths (GOSs) of the valence-shell excitations of HCl measured by the high-energy electron scattering, the optical oscillator strengths (OOSs) have been obtained by extrapolating the GOSs to the limit of the squared momentum transfer K2 → 0. Furthermore, the ICSs of the valence-shell excitations from the threshold to 5000 eV have been obtained systematically with the aid of the BE-scaling method.
Energy levels structure of Pr II - Gd II ions
Authors: Radžiūtė L , Gaigalas G , Rynkun P , Kato D , Tanaka M 
Published: June 2020

Synopsis
Observations of a kilonova associated with GW170817 provide a unique opportunity to study heavy element synthesis in the universe. However, the atomic data of r-process elements are not yet complete enough to decipher the light curves and spectral features of kilonovae. We performed extended atomic calculations for singly ionized elements with Z = 59 – 64, by employing GRASP2K package. These computations are based on strategies of Nd II published in [1]. Accuracy of data is evaluated by comparing computed energy levels with the NIST database and other authors.
Development of the numerical Hartree-Fock method for screened atoms with Debye-Hückel potential
Authors: Jiao L G , Ma J , Ho Y K 
Published: June 2020

Synopsis
The difficulties in developing the numerical Hartree-Fock programs for atoms interacting with screened Coulomb potential have been overcome. The binding energies of atoms for various screening parameters are obtained in high accuracy. C4+ ion is investigated to demonstrate the validity of our program.
Theoretical study on KLL dielectronic and higher-order recombination of boron-like isoelectronic sequence
Authors: Xie L Y , Lu S M , Zhang D H , Jiang J , Wu Z W , Dong C Z 
Published: June 2020

Synopsis
The K-shell dielectronic (DR), trielectronic (TR), and quadruelectronic (QR) recombination have been systematically studied for highly charged B-like ions with Z=14-50 by using the FAC code. Strong configuration mixing are found that significant influence the Auger rate, and TR strengths, and leads to irregular changes of TR/DR strength ratio along B-like sequence.
The radiative decay process of 2s2p configuration of He-like ions
Authors: Cao M X , Ding X B , Zhang D H , Zhang M W , Xue Y L , Yu D Y , Dong C Z 
Published: June 2020

Synopsis
The electron correlation effects are crucial to the two-electron one-photon transition of double K hole excited state. Appropriate correlation model was constructed to investigate this process of 11 selected He-like ions of Z from 10 to 47. Good agreement to the previous work and some new transition data were obtained.
Three-body fragmentation of CF4
3+ induced by 1 keV electron collision
Authors: Chen L , Shen Z J , Wang E L , Zhao X , Shan X , Chen X J 
Published: June 2020

Synopsis
We report the investigation on three-body fragmentation of CF4
3+ induced by 1 keV electron collision utilizing an ion momentum spectrometer. With the help of coincidence measurement for three fragment ions, the channel CF4
3+→F++CF2++F+ is identified. By employing Dalitz plot and Newton diagram, a sequential path-way and a concerted pathway are uncovered, which are further separated by momentum correlation of two F+ ions. We find that the CF4
3+ fragmentation prefers a sequential pathway CF4
3+→F++CF3
2+→F++ F++CF2
+.
Concept and simulations of a high-resolution asymmetric von Hamos X-ray spectrometer for CRYRING@ESR electron cooler
Authors: Jagodziński P , Banaś D , Pajek M , Warczak A , Beyer H F , Gumberidze A , Weber G , Stohlker Th , Trassinelli M 
Published: June 2020

Synopsis
A concept of a high resolution asymmetric von Hamos X-ray spectrometer for the CRYRING@ESR electron cooler is described and its characteristics obtained by ray-tracing Monte-Carlo simulations are presented. The spectrometer will be used to study the QED effects in H-like medium-Z ions by measuring the energies of X-rays from radiative recombination of highly charged ions with cooling electrons, with a ppm precision of energy determination.
Polarizabilities and tune-out wavelengths of the hyperfine ground states of 133Cs atom
Authors: Jiang J , Li X J , Wu Z W , Zhang D H , Xie L Y , Dong C Z 
Published: June 2020

Synopsis
The static and dynamic electric dipole polarizabilities of the ground state and hyperfine ground states of the 133Cs have been calculated by using relativistic configuration interaction plus core polarization (RCICP) approach. The tune-out wavelengths of ground and hyperfine ground states are also determined.
Statistical process in nitrogen containing naphthalene derivatives in collision with fast electrons and protons
Authors: Najeeb P K , Vinitha V , Kala A , Bhatt P , Safvan C P , Vig S , Kadhane U 
Published: June 2020

Synopsis
The effect of nitrogen substitution and isomerization in naphthalene under swift charged particle collision is investigated. The ratios of single ionization to capture cross-section are measured for the case of naphthalene and two of its nitrogen-containing derivatives. The propensity of HCN loss in quinoline and isoquinoline is shown to alter systematically from evaporation dominated to randomization dominated process in the case of monocation. The influence of plasmon excitation process in polycyclic aromatic nitrogen heterocycles (PANHs) is identified for the first time.
Virtual Laboratory Astrophysics and the STARK-B database VAMDC node: a resource for electron and ion impact widths and shifts of isolated lines
Authors: Sahal-Bréchot S , Dimitrijević M S , Moreau N 
Published: June 2020

Synopsis
Stark broadening theories and calculations can now be considered as mature. The fast computers allow to calculate a great number of atomic data needed for accurate spectroscopic diagnostics and modeling, such as for stellar atmospheres and envelopes, laboratory and technological plasmas, and laser equipments. Thus the access to these data via an on line database is essential. The STARK-B database is intended to meet this need. It contains calculated widths and shifts of isolated atomic lines due to electron and ion impacts. It is still under development and will be presented at the Conference.
K-shell Photoionization of the N+, NH+ and

NH2+

ions
Authors: Mclaughlin B M , Mosniert J P , Kennedy E T , Sokell E , Bizau J M , Cubaynes D , Guilbaud S , Carniato S 
Published: June 2020

Synopsis
Single and double photoionization cross-sections in the photon region straddling the nitrogen K-edge and up to photon energies of ∼450 eV, for the atomic N+ and molecular NH+ and

NH

2
+

species were measured at the SOLEIL radiation facility in Orsay, France. The measurements are compared with theoretical estimates.
R-matrix electron-impact excitation data for the C-like isoelectronic sequence
Authors: Mao J , Badnell N R 
Published: June 2020

Synopsis
Emission and absorption features from C-like ions are served as temperature and density diagnostics of astrophysical plasmas. R-matrix electron-impact excitation data for C-like ions in literature cover merely a handful of ions. Here we present a systematic intermediate coupling frame transformation R-matrix calculations for C-like ions from N II to Kr XXXI. The effective collision strengths cover a wide range of temperature. Our results are compared with archival databases and literature results.
Coincidence time-of-flight mass spectrometry of electron impact on anthracene using a field programmable gate array
Authors: van der Burgt P J M , Gradziel M L 
Published: June 2020

Synopsis
A new data acquisition system for electron-impact time-of-flight mass spectrometry has been set up, in which a field programmable gate array is used for the timing and the recording of mass spectra on an event by event basis. Fragmentation studies of anthracene have shown clear evidence for double ionization above 21 eV electron impact, which provides the motivation to look for coincident fragments. The first results for coincidence mass spectrometry of anthracene will be presented at the conference.
H2O single ionization by light particle-impact: fully differential cross sections
Authors: Acebal E , Otranto S 
Published: June 2020

Synopsis
Fully differential cross sections for the single ionization of the 1b
1 and 3a
1 orbitals of H2O by electron- and positron-impact are calculated by means of the CDW-EIS model at an impact energy of 81 eV. A proper average procedure over molecular orientations is performed. Main differences between positron- and electron-impact are observed for coplanar geometries in the binary structures. In addition, an enhancement of the binary region and a decrease of the recoil lobe are observed for positron-impact.
Photoionization of superheavy elements
Authors: Khademhosseini R , Razavi A , Keating D A , Deshmukh P C , Manson S T 
Published: June 2020

Synopsis
Calculations of the photoionization cross sections for the superheavy atoms of atomic numbers 102, 112 and 118 have been performed using the relativistic-random-phase approximation (RRPA) which is based on the Dirac equation. The results show that relativistic effects cause anomalies in level ordering for some inner shells, and that interchannel coupling is of great importance.
Photodouble ionization of water
Authors: Randazzo J M , Turri G , Bolognesi P. , Sugimoto H , Mathis J , Ancarani L U , Avaldi L 
Published: June 2020

Synopsis
The photodouble ionization of water has been studied experimentally by photoelectron-photoelectron angular resolved coincidence experiments and theoretically by applying the Generalized Sturmian Functions approach. The measured differential cross sections present a rich angular distribution that can be, in part, reproduced by a first order treatment of the interaction considering a two active electrons target.
Coherence properties of the projectile’s beam: The missing piece of the C6+ + He ionization puzzle
Authors: Navarrete F , Ciappina M F , Barrachina R O 
Published: June 2020

Synopsis
We analyze the influence of the coherence of the projectile’s beam in scattering phenomena. We focus our study in the ionization of He by C6+ projectiles at 100 MeV/amu. Our calculations, which had been previously performed for only the scattering and perpendicular collision planes and within the First Born approximation, were repeated for an ampler set of collision planes and with a more refined model. We obtain a very good agreement with the experimental results.
Multiple ionization effect in Dy, Ho and Er at low proton energy
Authors: Kaur M , Mohan H , Jain A K , Singh P S , Sharma S 
Published: June 2020

Synopsis
The L shell X-ray production cross sections for elements (Z = 66, 67 and 68) at three different low proton energies i.e. 260, 280 and 300 keV have been investigated. Calculations are based on the ECPSSR model and its modified form i.e. ECPSSR-UA model. During calculations with ECPSSR theory, a significant phenomenon known as multiple ionization (MI) has been included. Theoretically calculated values are compared with the experimental values. The calculations with ECPSSR-MI shows improved results.
Triple differential cross sections for electron-impact ionization of atomic and molecular targets
Authors: Houamer S , Khatir T , Dal Cappello C 
Published: June 2020

Synopsis
Triple differential cross section for ionization of atomic and molecular targets by electron impact is calculated using approximate three body waves. The post-collisionnal interaction (PCI) between the outgoing electrons as well as the distortion effects of the ejected electron are included. The effect of the short range potential is evenly investigated. Results are compared with available data.
Laser-induced deformation of an inner valence molecular orbital in ethanol
Authors: Akagi H , Otobe T , Itakura R 
Published: June 2020

Synopsis
We reveal that an intense laser field deforms an inner valence orbital (10a′) in the ethanol molecule. Using photoelectron-photoion coincidence momentum imaging, we measure the recoil-frame photoelectron angular distribution (RFPAD) for the CD2OH+ production channel of CH3CD2OH induced by a circularly polarized intense (I
0 ≈ 8×1013 W/cm2) near-infrared (λ ≈ 795 nm) laser field. Ab initio simulations show that the orbital deformation depends strongly on the laser field direction, and that the measured RFPAD cannot be reproduced without taking the orbital deformation into account.
Enormous enhancement of molecular ionization at high x-ray intensity
Authors: Inhester L , Hao Y , Son S-K , Santra R 
Published: June 2020

SynopsisThe ultra-intense and ultra-short x-ray pulses provided by X-ray Free-Electron Lasers (XFELs) sequentially ionize molecular samples many times. In this context, we have recently discovered that under intense x-ray radiation the total charge of a molecule is enhanced compared to the sum of charges of its constituent isolated atoms[2, 3]. We report here on new theoretical results[5] for iodobenzene (C6H5I) that show an even stronger ionization enhancement than previously observed for iodomethane (CH3I)[3].
Electron-induced decomposition of the coenzyme Q0
Authors: Ameixa J , Meißner R , Arthur-Baidoo E , Lochmann C , Ončák M , Beyer M K , Ferreira da Silva F , Denifl S 
Published: June 2020

Synopsis
We report on the formation of anions through electron attachment to the coenzyme Q0 in the gas-phase. It represents the functional group of the electron carrier coenzyme Q10, which plays a key role in the electron transport chain in the mitochondrial complex. The parent anion is most abundantly formed in a near-zero eV resonance, presumably correlating with the electronic ground state of the molecule. This observation accounts for the ability of coenzyme Q10 to capture and transport electrons in biological processes.
Influence of ionizing radiation on molecular recognition in the gas phase: VUV and X-ray photoabsorption of antibiotic-receptor non-covalent complexes
Authors: Abdelmouleh M , Lalande M , Espinosa Rodriguez A , Vizcaino V , Rangama J , Schlathölter T , Poully J-C 
Published: June 2020

Synopsis
The intrinsic effects of ionizing radiation on molecular recognition between an antibiotic and its re-ceptor have been probed by coupling a synchrotron beamline to a tandem mass spectrometer. Protonated vanco-mycin-receptor non-covalent complexes in the gas phase undergo inter-as well as intramolecular bond cleavage due to internal energy transfer after photoabsorption in the VUV-X energy range. The deprotonated complex undergoes electron detachment, but the native interactions underlying molecular recognition are not systematically lost.
Ab initio study of energy characteristics of small polyatomic molecules in threshold electron-impact dissociative ionization processes
Authors: Demes S , Remeta E 
Published: June 2020

Synopsis
A joint theoretical study of electron-impact dissociative ionization (DI) processes of small polyatomic molecules is presented. Different organic (CH4 and C2H6) and inorganic (SF6 and Sn, n = 2-8) target molecules were examined. The investigated dissociative ionization processes take place at threshold energies, so our main focus is to study the appearance energies (E
ap) of different ion fragments as well as to analyse the corresponding DI reaction pathways.
Electron-impact ionization cross section calculations for 5-chloropyridine and 5-bromopyridine molecules
Authors: Żywicka B , Możejko P 
Published: June 2020

Synopsis
The total cross sections for the single electron-impact ionization of 5-chloropyridine (5-C5H4ClN) and 5-bromopyridine (5-C5H4BrN) molecules have been calculated using binary-encounter-Bethe method for electron energies ranging from the ionization threshold up to 5 keV.
Energy-transfer in collisions of low velocity ions with CO molecules
Authors: Nakamura M , Ichimura A 
Published: June 2020

Synopsis
The energy transfer in collisions of low velocity ions with CO molecules is theoretically investigated. Energy loss spectrum of ions scattered by CO molecules is obtained with using the classical trajectory (CT) calculation and the sudden-limit models. Both of the calculations well reproduce an experimental spectrum with a considerable accuracy. Rotational excitation is found to be principal energy transfer process from translational to internal motions.
Ionization and fragmentation of fluorene in collisions with 50-300 keV proton
Authors: Bagdia C , Tribedi L C 
Published: June 2020

Synopsis
In this report, we present the study of ionization and fragmentation of fluorene (C13H10) molecule upon intermediate energy proton impact. We have measured the TOF spectra of fluorene molecule to identify various fragmentation channels. We have also measured the projectile energy dependence of single and double ionization of fluorene molecule.
Study of chiral asymmetries in the inner-shell photoionization of partially oriented trifluoro-methyloxirane
Authors: Nalin G , Grundmann S , Kastirke G , Fehre K , Trabert D , Rist J , Weller M , Waitz M , Siebert J , Vela-Perez I , Khan A , Anders N , Kircher M , Tomar R , Hofmann M , Trinter F , Küstner-Wetekam C , Marder L , Viehmann J , Fukuzawa H , Ueda K , Williams J B , Jahnke T , Dörner R , Schöffler M S 
Published: June 2020

Synopsis
Photoelectron circular dichroism (PECD) was determined for O(1s) photoionization of methyloxirane (C3H6O) and trifluoro-methyloxirane (C3H3F3O). Several electron energies above the threshold were chosen to compare the partially fixed-in-space electron distributions.
Distorted wave model for sub-shell electron capture cross sections of noble gases by bare ion impact
Authors: Purkait M 
Published: June 2020

Synopsis
Electron capture from noble gases (He, Ne and Ar) are investigated in the framework of the quantum-mechanical distorted wave model. In this model, we use an independent electron model taking particular care of the representation of the bound and continuum target states. The results for partial and total capture cross sections are compared with other theoretical calculations and experimental data. The present results are found to be in very good agreement with the available experimental findings.
Three-body fragmentation dynamics of CH2CCH2
3+ investigated by Ne8+ impact
Authors: Ma C , Xu S , Zhao D M , Guo D L , Yan S C , Feng W T , Zhu X L , Ma X 
Published: June 2020

Synopsis
The three-body fragmentation dynamics of triply charged allene (CH2CCH2
3+) induced by 50-keV/u Ne8+ ion impact is studied by measuring the charged fragments in triple coincidence using reaction microscope. We focus on the fragmentation dynamics of two completely measured fragmentation channels, H++CH++C2H2
+ and H++CH2
++C2H+. Both concerted and sequential dissociation mechanisms are observed for these two channels. The estimation of relative contributions of different fragmentation pathways is presented.
Theoretical investigation of dissociative electron attachment (DEA) study for halogen targets
Authors: Vinodkumar M , Yadav H , Limbachiya C , Vinodkumar P C 
Published: June 2020

Synopsis
Recently dissociative electron attachment (DEA) study has geared up due to its many fold applications in various fields. Here we have presented some of the results of DEA cross sections of few halogen targets of interest.
Dissociative electron attachment to supersonically cooled oxygen
Authors: Nandi D , Jana I , Ramaprasad V 
Published: June 2020

Synopsis
Formation of O− and

O
2
−

ions via DEA to a supersonic jet of O2 having weakly bound van der Waals clusters is reported. The ion-yields show three peaks near 7, 11 and 16 eV electron energies where the 7 eV peak arises from the 2Π
u
state of

O
2
−

. The 11 and 16 eV peaks are ascribed to two resonance states

2

Σ

g
+

and

2

Σ

u
+

respectively, through a violation of σ−
selection rule. Ar was used as a refrigerant carrier gas and cross-section dependence of the two new peaks on the proportion of carrier gas used is experimentally observed, eventually leading to an optimum O2 : Ar ratio.
Electron impact scattering study on formyl fluoride (HFCO)
Authors: Jani T , Yadav H , Prajapati D , Vinodkumar M , Vinodkumar P C 
Published: June 2020

Synopsis
Electron impact scattering studies with organic compounds play a significant role in studies related to astrophysics and radiation physics. We present here electron impact scattering studies on formyl fluoride as no cross-sectional data is available to the best of our knowledge. Total scattering cross sections (TCS) on comparing with iso-electronic molecule reveals that at low energy molecular dipole moment plays a significant role in cross-section deviation and at high energy the tendency seems to be same in all the formyl series.
Measurement and analysis of emission spectrum of laser-produced Ni plasma in the range of 7-14 nm
Authors: He S Q , Su M G , Cao S Q , Wu L , Lu H D , Min Q , Sun D X , Dong C Z 
Published: June 2020

Synopsis
We measured and analyzed the emission spectrum of laser-produced Ni plasma in the range of 7-14 nm. The dominant transition arrays were identified as 3p63dn−3p63dn−1f and 3p53dn+1−3p53dn4f from Ni6+ to Ni9+ ions with aid of the Hartree-Fock calculations with configuration interaction effects. The plasma parameters have been obtained by comparison of experimental and simulated spectrum based on a steady-state collisional-radiative (CR) model.
Strong enhancement of electron-ion recombination induced by free-bound and bound-bound resonance transitions
Authors: Kislov K S , Narits A A , Lebedev V S 
Published: June 2020

Synopsis
The role of free-bound and bound-bound resonant nonadiabatic transitions on electron-ion recombination in plasma of noble gas mixtures is studied. A kinetic model of recombination is proposed which includes the energy relaxation in collisions with electrons, resonant and non-resonant electron capture to Rydberg states through collisions of atomic ions with neutral particles, and resonant n → n’ transitions. It is shown that the resonant processes considered may strongly enhance total recombination coefficient even at relatively high degrees of ionization of plasma.
Investigation of temporal-resolved spectra of laser-produced titanium plasmas
Authors: Zhang D H , Zhao J N 
Published: June 2020

Synopsis
Laser-produced titanium (Ti) plasmas have been measured using temporal-spatially resolved laser-produced plasma emission spectroscopy technique. The emission peaks in the wavelength range of 7.5-15 nm were identified from the 3s-(4,5)p, 3p-4d, and 3d-4f transition lines from Ti5+ to Ti11+ ions with aid of NIST database and Cowan atomic structure calculations, as well as comparative analysis between experimental and simulated spectra based on a simplified radiation hydrodynamic model.