bluuebunny/crossref_metadata_2025_split huggingface dataset:
Role of methylation in electron scattering on X(CH3)4 (X = C, Si, Ge) molecules
Authors: Stefanowska-Tur S , Szmytkowski Cz , Ptasińka-Denga E , Mozejko P 
Published: June 2020

Synopsis
Total cross sections (TCS) for low-energy electron scattering from X(CH3)4 (where X = C, Si, Ge) molecules have been measured using linear transmission method. Present results and those obtained previously for XH4 molecules were used to determine how methylation of the target is reflected in TCS energy dependence.
Investigation of TEOP transitions in dielectronic recombination with H-like ions
Authors: Lyashchenko K N , Andreev O Yu , Yu D 
Published: June 2020

Synopsis
We consider theoretically the process of dielectronic recombination (DR) with H-like ions where two-electron one-photon (TEOP) transitions take place. We focus our attention on the channel with transitions to the ground state of the He-like ions and emission of Kαα
photon. Total and differential cross sections of DR with TEOP are calculated for wide range of H-like ions: from B4+ to Xe53+. The resonant Fano-like structure of the cross section is observed. The resonant energies, widths and TEOP transition probabilities are calculated.
Cascade and direct processes in multiple Auger decay of core-excited states of N2
Authors: Odagiri T , Taniguchi T , Kaneyasu T , Tanaka H , Adachi J , Lablanquie P , Hikosaka Y 
Published: June 2020

Synopsis
We report here a detailed experimental study on multiple Auger decay after core excitation into the π*
valence and Rydberg orbitals in N2 by an electron-electron coincidence technique.
On the effect of cascade transitions after electron-impact excitation of Zn by spin-polarized electrons
Authors: Bartschat K , Zatsarinny y , Bostock C J , Fursa D V , Bray I , Grum-Grzhimailo A N 
Published: June 2020

Synopsis
We investigate the possible effect of cascade transitions from the (4s5p)3P0,1,2 states to the (4s5s)3S1 state of Zn. Our calculations suggest that the excitation cross sections and the polarization of the cascade radiation cannot explain the serious controversy between two existing experimental datasets below the cascade threshold and raise additional questions regarding the measurements at higher energies.
Electron impact excitation of highly charged Ge-Like Xe ion
Authors: Bharti S , Sharma L , Srivastava R 
Published: June 2020

Synopsis
A systematic study of electron impact excitation of Ge-like highly charged xenon ions have been carried out in Extreme Ultraviolet (EUV) range within fully relativistic multiconfiguration Dirac-Fock framework. The cross section calculation reported here are performed for dipole allowed transitions for Xe22+ ions from ground state 4s24p2
to 4s24p3 and 4s24p4d excited fine structure levels. The analytic fitting for the cross section data for incident electron energy range within 50 to 1500 eV have been provided for further applications in various plasma diagnostic techniques.
Development of accurate anharmonic vibrational state theory using a novel vibrational coordinate based on backflow transformation
Authors: Ishii K , Tashikawa M , Kita Y 
Published: June 2020

Synopsis
The anharmonic vibrational state theory based on quantum Monte Carlo method is one of the most accurate methods to solve a vibrational Schrödinger equation of molecular systems. In anharmonic vibrational state analyses, one should take account of the inter-mode couplings, which cannot be included by the conventional normal mode coordinates only. In this study, thus, we have developed a novel vibrational coordinate based on backflow transformation which enable us to take correlation effects in quantum many-body systems directly.
Distribution of dipole oscillator strengths for the formation of excited hydrogen atom from C2H2
Authors: Kumagai Y , Odagirit T , Nakano M , Suzuki I H , Hosaka K , Kitajima M , Kouchi N 
Published: June 2020

Synopsis
Dipole oscillator strengths for the formation of excited hydrogen atom from C2H2 were measured to investigate formation and decay of molecular superexcited states. It seems that non-adiabatic transition plays an important role in the formations of the hot hydrogen atom.
Suppression of the AC-Stark shift by vortex light beams
Authors: Schulz S A-L , Muller R A , Surzhykov A 
Published: June 2020

Synopsis
In this work, we present how the AC-Stark shift can be suppressed by using twisted light beams for photoexcitations. Twisted light beams carry a non-zero projection of orbital angular momentum (OAM) onto their propagation direction, have a helical phase front and an intensity minimum in the beam center. Atoms located in this minimum experience a reduced AC-Stark shift and, therefore, twisted beams may be considered as valuable tool to drive atomic clock transitions. In this contribution, particular emphasis is paid to the electric-octupole (E3) transition 2
S1/2
→ 2
F7/2
in the 171 Yb+ ion.
Heavy metal spectroscopy in extremely metal rich subdwarfs
Authors: Fernández-Menchero L , Ballance C P , Ramsbottom C A 
Published: June 2020

Synopsis
Helium-rich subdwarf B stars represent a small group of low-mass hot stars. A number of significant but unfamiliar absorption lines have been identified of heavy-metal ions, such as germanium, strontium, yttrium and zirconium. The abundances in the photosphere of theses element was estimated between 1000 and 10 000 times the solar. We calculate the collision-radiative data for the ions Sr+, Y2+ and Zr3+. Comparing with measured spectra we can determine these abundances. We compare the obtained results with the RMATRX and DARC methods.
Time-dependent perturbation theory beyond the dipole approximation for two-photon ionization of atoms
Authors: Wang M , Liang H , Xiao X , Chen S , Peng L 
Published: June 2020

Synopsis
We develop a time-dependent perturbation theory beyond the dipole approximation to analyze the two-photon ionization dynamics of atoms exposed to short laser pulses with an arbitrary polarization. Subse-quent applications of the PT method in the nonresonant regime allow us to analyze one of the most important nondipole effects, i.e., the linear-momentum-transfer law in the two-photon ionization process and to unveil the important role of the interferences between the dipole and nondipole transition pathways to the photoelectron momentum shift along the laser-propagation direction.
Water molecule ionization by proton impact experiment and GTO-First Born theory
Authors: Della Picca R , Cariatore D , Fiol J , Fregenal D , Bernardi G 
Published: June 2020

Synopsis
In this communication we present calculations and measurements of water ionization by protons at intermediate and high impact energies. The main goal of the present theoretical approach is the development of a method to routinely incorporate sophisticated wavefunctions for small and medium-sized molecules in the determination of ionization cross-sections.
Kinetic energy release in dissociation of NH3
q+ under ion impact
Authors: Safvan C P , Sairam T , Bhatt P 
Published: June 2020

Synopsis
The dynamics of the dissociation of multiply charged ammonia ions is investigated. The pathways for sequential and concerted dissociation are separated, and the kinetic energy released along the different pathways is measured. The measured values are compared with ab-initio quantum chemical calculations to identify the repulsive states of the molecular ion which are responsible for the two pathways.
Nonlinear Cooper minimum as a precise tool for understanding multiphoton photoionization
Authors: Hofbrucker J , Volotka A V , Fritzsche S 
Published: June 2020

Synopsis
A new approach to accurately assess multiphoton ionization is suggested. Vanishing of the dominant ionization channel in nonresonant (direct) multiphoton ionization is predicted for a specific incident photon energy. The exact energy position of such nonlinear Cooper minimum can be accurately measured and requires calculations of the complete electronic spectrum. Measurements of various observables at these photon energies are desirable for further evaluation of theoretical calculations at hitherto unreachable accuracy.
The importance of energy-differential cross sections highlighted in a benchmark for positronium formation in the Galaxy
Authors: Cocks D G , Chaudhary H , Machacek J R 
Published: June 2020

Synopsis
We detail a benchmark model aimed at improving the implementation of Monte Carlo codes for simulations of positrons propagating through interstellar media. The benchmark highlights the key features of cross sections sets which lead to major differences in astronomical observables. One of these is the energy-differentiation of the ionisation cross section. This leads us to call for improved cross section sets for all constituents of interstellar media.
Projectile coherence effects analyzed using impact parameters determined by classical trajectory Monte Carlo calculations
Authors: Nagy L. , Járai-Szabó F. , Borbély S. , Tőkési K. 
Published: June 2020

Synopsis
We analyze the dependence of the fully differential ionization cross section on the coherence width of the wave packet associated to the projectile. The wave packet beside its size is characterized by the closest distance of its center relative to the target (the impact parameter). We determine the distribution of the possible impact parameters by classical trajectory Monte Carlo calculations.
Auger decay of Rubidum atom after 3d-shell ionization
Authors: Palaudoux J , Penent F , Khalal M , Jänkälä K , Keskinen J , Huttula M , Bizau J-M , Cubaynes D , Guilbaud S , Zitnik M , Bucar K , Ito K , Andric L , Lablanquie P 
Published: June 2020

Synopsis
We present here the different Auger decay paths following 3d inner-shell ionization of Rubidium atom and we observe the peculiar behaviour and correlation effects due to the outer, unpaired 5s electron. This electron can be submitted to shake-up during 3d ionization. Also shake-up and shake-down of the outer electron are observed in the Auger decay. Cascade double Auger decay is the dominant process leading to Rb3+ ion.
Differential cross sections for ionisation of helium by proton impact
Authors: Alladustov S U , Abdurakhmanov I B , Kadyrov A S , Bray I , Bartschat K 
Published: June 2020

Synopsis
A wave-packet convergent close-coupling approach is applied to study differential ionisation in proton-helium collisions. The fully differential cross sections for electrons ejected with energy of 5.4 eV are investigated in 75 keV proton-helium collisions. We also study the doubly differential cross sections for electrons ejected with energies up to 65 eV at intermediate projectile energies (50-150 keV). The results are converged regarding the number of pseudostates included and are in fairly good agreement with the available experimental data.
Classical calculations of differential electron emission in fast heavy-ion collisions with water molecules
Authors: Jorge A , Horbatsch M , Illescas C , Kirchner T 
Published: June 2020

Synopsis
We present a classical study of differential electron emission cross sections for highly-charged projectiles at υp
∼ 10 a.u. impinging on water molecules [1, 2]. Comparisons with Continuum Distorted Wave Eikonal Initial State theoretical results and with experimental data are presented. We implement a time-dependent screening effect in our model and account for the molecular target structure by means of a three-center potential.
Three body dissociation of

SO2q+
Authors: Rajput J , Kumar H , Bhatt P , Safvan C P 
Published: June 2020

Synopsis
Multiply charged ion impact induced three body fragmentation pathways of

SO

2

q
+

(q=3, 4) molecular ions have been studied using the technique of recoil ion momentum spectroscopy. An attempt has been made to distinguish the three-body breakup based on mechanism of dissociation, whether sequential or concerted.
Angular distribution in two-body dissociation of

SO2q+
Authors: Rajput J , Kumar H , Bhatt P , Safvan C P 
Published: June 2020

Synopsis
The two-body dissociation of multiply charged SO2 molecules is studied using a recoil ion momentum spectrometer. These molecular ions were generated in collision of the neutral parent with an energetic highly charged ion. From the measured momenta of the recoil ions, angular distributions are generated with respect to the incoming beam direction and are found to vary strongly with kinetic energy release.
The interaction of 355nm laser light on Adenine and Uracil
Authors: Hallado L , Prieto E , Álvarez I , Guerrero A , Cisneros C 
Published: June 2020

Synopsis
Dissociation and ionization of adenine and uracil were investigated in the multiphoton absorption re-gime using laser pulse at 355nm in conjunction with TOF mass spectrometry in reflectron mode (R-TOF). In contrast of previous investigations where a notorious amount of low mass ions was detected arising from both molecules.
Ion induced fragmentation of diatomic molecular clusters
Authors: Méry A , Agnihotri A N , Douady J , Fléchard X , Gervais B , Guillous S , Iskandar W , Jacquet E , Kumar V , Matsumoto J , Rangama J , Ropars F , Safvan C P , Shiromaru H , Zanuttini D , Cassimi A 
Published: June 2020

Synopsis
Weakly bound atomic or molecular clusters are of growing interest in the fields of atmospheric science, hadron-therapy or astrophysics. We will present our recent experimental results on the fragmentation of diatomic molecular dimers after irradiation by highly charged ions. For (N2)2 dimers, the measured KER spectrum is very similar to the one of the N2 monomers but is globally shifted towards higher energies. Moreover, sequential dissociation of the (CO)2 dimers has been observed when metastable states of the CO2+ dications are populated.
Electron–beam ion trap/source for ion–molecule collisions in the non-perturbative regime
Authors: Bapat B , Sharma D , Srivastav S 
Published: June 2020

Synopsis
An Electron Beam Ion Trap and Source has been installed at the Indian Institute of Science Education and Research Pune. The source, manufactured by Dreebit GmbH, will provide ions up to Ar16+ at energies up to 30 keV/q. These will be used for studying ion-molecule collisions in the non-perturbative regime.
Dissociative multiple ionization of the H2O molecule induced by ion impact: experimental and theoretical results
Authors: Kovaćs S T S , Herczku P , Juhász Z , Sarkadi L , Gulyás L , Chesnel J-Y , Sulik B 
Published: June 2020

Synopsis
Fragment energy spectra of the water molecule impacted by singly charged (SCI) and highly charged (HCI) ions have been measured in crossed beam experiments. Double differential fragmentation cross sections (DDCS) have been determined. Similarities and differences of the measured DDCSs induced by the medium- and low-energy projectiles have been analyzed. Multiple target ionization cross sections have been deduced and they were further analyzed through the results of the CTMC and CDW-EIS models.
Angle-resolved Auger spectroscopy of K-shell ionized molecules
Authors: Fuchs S , Paul D , Buhr T , Ricz S , Schippers S 
Published: June 2020

Synopsis
We report on measured oxygen K-LL Auger spectra induced by 1.5-keV electron impact on O2, CO2, and N2O gaseous targets. An ESA-22-type electron spectrometer was employed which is capable of simultaneous energy and angular analysis covering a polar angular range of 15° to 345°. The measurements were carried out in preparation for future experiments with more complex chiral molecular targets and a spin-polarized electron source. The present experimental data are compared with results from earlier experimental studies.
Li-like carbon Auger KLL measurements of mixed-state C4+(1s2
1S, 1s2s 3S) ions in 6-15 MeV collisions with He and comparison to 3eAOCC calculations
Authors: Madesis I , Laoutaris A , Benis E P , Zouros T J M , Dubois A 
Published: June 2020

Synopsis
New state-resolved Li-like carbon Auger KLL measurements of mixed-state C4+(1s2
1S, 1s2s 3S) ions in 6-15 MeV collisions with He are presented. Results of three-electron semiclassical atomic orbital AOCC coupled channel (3eAOCC) calculations are also presented and compared.
Radiative double electron capture for 2.11 MeV/u F9+,8+ + N2, Ne
Authors: La Mantia D S , Kumara P N S , Buglione S L , McCoy C P , Taylor C J , White J S , Kayani A , Tanis J A 
Published: June 2020

Synopsis
The first successful observation of radiative double electron capture for gas targets is reported. RDEC has been observed for 2.11 MeV/u F9+,8++N2, Ne collisions. Cross sections for both projectile charge states and targets were determined and compared with previous results and theory. This abstract gives an overview of the results found for both gas targets.
The low energy beamline of the FISIC experiment: current status of construction and performance
Authors: Schury D , Méry A , Ramillon J M , Adoui L , Chesnel J-Y , Lévy A , Macé S , Prigent C , Rangama J , Rousseau P , Steydli S , Trassinelli M , Vernhet D , Gumberidze A , Stöhlker Th , Bräuning-Demian A , Hahn C , Spillmann U , Lamour E 
Published: June 2020

Synopsis
Ion-ion collisions between slow (kev/u) and fast (MeV/u) ions play an important role in for example astrophysical or inertial fusion plasmas as well as in ion-matter interaction. In this regime the energy transfer is maximum, as all primary electronic processes reach their maximum. At the same time up to today no reliable experimental data exists while being difficult to treat accurately by theory. We present the current status and performance of the low energy beam-line of the FISIC experiment which aims at filling in the blanks in this regime.
Kinetic energy release (KER) of vibrationally cold HeH+: experiments at the reaction microscope in the Frankfurt low-energy storage ring (FLSR)
Authors: Müller J C , Dörner R , Schmidt L Ph H , Schöffler M S , Stiebing K E 
Published: June 2020

Synopsis
The installation of a reaction microscope (COLTRIMS [1]) in the electrostatic Frankfurt Low Energy Storage Ring (FLSR) [2] has been completed. A first experiment, exploring the KER for dissociative electron transfer to HeH+ ions at 20 keV from a cold supersonic He gas target have been carried. Even at the moderate vacuum of 10−8 mbar a change of the KER and the Q value distribution due to cooling of the molecular ions during the storage time can be observed. In this contribution the final experiment, performed after heating the ring will be discussed.
Dissociative recombination and vibrational excitation of molecular cations with electrons: application to H2
+, BeH+ and their isotopomers
Authors: Pop N , Iacob F , Mezei J Zs , Niyonzima S , Motapon O , Schneider I F 
Published: June 2020

Synopsis
Cross sections and Maxwell rate coefficients for the low-energy reactive collisions of electrons with Hydrogen and Beryllium hydride cations will be presented, as well as a discussion on the major relevant mechanisms and features – direct/indirect process, ro-vibronic couplings, ro-vibrational dependence.
Electron dissociative attachement to ArH+, HD+, N2
+ and CO2
Authors: Abdoulanziz A , Djuissi E , Argentin C , Moulane Y , Bultel A , Mezei J Zs , Tennyson J , Chakrabarti K , Laporta V , Schneider I 
Published: June 2020

Synopsis
We will present our recent results in the study of electron-induced reactivity of ionized and neutral molecules. The Configuration Interaction method and the Multichannel Quantum Defect Theory have been employed in order to obtain cross sections for collisions of electrons with ArH+, HD+, N2 and CO2.
On-the-fly dynamics simulation of dissociative electron attachment to chloroethane
Authors: Kossoski F , Barbatti M 
Published: June 2020

Synopsis
We present a novel theoretical approach for describing dissociative electron attachment. It is is based on classically propagating the nuclei on the potential surface of the resonant anion, which is described by bound state methods, while electron autodetachment is taken into account with an ad-hoc model built from scattering calculation results. As a first application, we considered the electron induced dissociation of chloroethane. Comparison to experimental data is very encouraging. The simulations reveal further details on the underlying dynamics of the dissociation.
Methylation effect in e−— scattering on methyl-substituted ethylenes
Authors: Stefanowska-Tur S , Szmytkowski Cz , Ptasińska-Denga E , Możejko P 
Published: June 2020

Synopsis
Methylation effect has been observed and studied in electron-scattering from selected hydrocarbon molecules. In measured total cross section (TCS) functions we have noticed energy shifts and changes in the intensity of observed structures.
Time delay in slow electron elastic scattering by potentials with arising levels
Authors: Amusia M Ya , Baltenkov A S 
Published: June 2020

Synopsis
We study Wigner time delay of slow electrons by spherically symmetric square potential well as a function of the well parameters. We show that the electron interaction with scattering center qualitatively depends on presence of discrete levels in the well. Electron retention mode by a potential well with no discrete level is replaced by the mode at which after level appears the incident electron hardly enters the scatterer. This behavior of time delay is universal since it is typical not only for the first but also for following arising s-levels.
On the e− – C60 elastic angle-differential scattering cross section
Authors: Dolmatov V K , Amusia M Ya , Chernysheva L V 
Published: June 2020

Synopsis
We study theoretically the experimental angle-differential elastic electron scattering off a C60 fullerene with the aim to elucidate whether its features depend primarily on the details of the full molecular potential of C60 or they can be understood without reference to the full nature of the potential. We demonstrate the success of the latter option.
Halogen loss induced by electron collisions in halouracils at low energies
Authors: Cornetta L M , Varella M T do N 
Published: June 2020

Synopsis
We employed both eletronic scattering techniques and ab initio quantum dynamics to study electron-driven reactions in halouracils at low energies. Particularly, it was addressed halogen dissociation and H-loss probabilities in anionic 5-BrU and 5-IU. Besides, we also propose a model of how to include auto-ionization probabilities during the dynamics.
Electron elastic scattering from Ho, Er, Tm, Yb, Lu and Hf atoms
Authors: Felfli Z , Msezane A Z 
Published: June 2020

Synopsis
We carefully investigate negative ion formation in the large lanthanide atoms Ho, Er, Tm, Yb and Lu as well as in atomic Hf through the electron elastic total cross sections (TCSs) calculation using the robust Regge-pole methodology. The TCSs are found to be characterized generally by ground, metastable and excited states negative ion formation. The extracted from the TCSs anionic binding energies (BEs), with those for the ground states corresponding to the definitive and unambiguous electron affinities (EAs), are contrasted with the measured and/or calculated EAs.
Diagnosing the lightning plasma temperature based on the collisional-radiative model
Authors: Zhang W , Jiang J , Yuan P 
Published: June 2020

Synopsis
The atomic parameters of the NII ion, including the energy levels, transition probabilities, collision sections, and collision excitation rate coefficients, have been calculated based on the multi-configuration Dirac-Fock method by implementing Flexible Atomic Code. The ratios of line intensity, I567.96nm/I500.52nm
, have been calculated by using the collisional-radiative model. The temperatures of six lightning plasma channels were then obtained, and they are consistent with temperatures obtained by using the multi-spectral lines method.
EUV spectroscopy of optically thin germanium plasmas in the 9-18 nm region
Authors: Maguire O , Kos D , O’Sullivan G , Sokell E 
Published: June 2020

Synopsis
EUV spectra have been recorded from optically-thin germanium laser produced plasmas created using a high-powered TEA CO2 laser. The Cowan suite of atomic codes has been used to identify previously unidentified lines in Ge VI-XI. The absence in the spectra of Δn=0 transitions for ion stages lower than Ge9+ has been interpreted by calculating line strength ratios for of Δn=0 to Δn=1 transitions for the relevant ion stages.