236 citations · 843 across the 18 of their papers we have counts for
19 papers
Water-assisted electron capture exceeds photorecombination in biological conditions
Axel Molle, Oleg Zatsarinny, Thomas Jagau +2
A decade ago, an electron-attachment process called interatomic Coulombic electron capture has been predicted to be possible through energy transfer to a nearby neighbor. It has be…
Chemical diversity among A-B stars with low rotational velocities: non-LTE abundance analysis
L. Mashonkina, T. Ryabchikova, S. Alexeeva +2
We present accurate element abundance patterns based on the non-local thermodynamic equilibrium (non-LTE, NLTE) line formation for 14 chemical elements from He to Nd for a sample o…
A Science Gateway for Atomic and Molecular Physics
Barry I. Schneider, Klaus~Bartschat, Oleg Zatsarinny +7
We describe the creation of a new Atomic and Molecular Physics science gateway (AMPGateway). The gateway is designed to bring together a subset of the AMP community to work collect…
Non-LTE analysis of K I in late-type stars
Henrique Reggiani, Anish M. Amarsi, Karin Lind +7
Older GCE models predict [K/Fe] ratios as much as 1 dex lower than those inferred from stellar observations. Abundances of potassium are mainly based on analyses of the 7698 re…
Electron-impact excitation and ionization of atomic calcium at intermediate energies
Oleg Zatsarinny, Henry Parker, Klaus Bartschat
We present a comprehensive study of electron collisions with calcium atoms by using the convergent \emph{B}-spline \emph{R}-matrix method. Elastic, excitation, and ionization cross…
Inelastic O+H collisions and the OI 777nm solar centre-to-limb variation
A. M. Amarsi, P. S. Barklem, M. Asplund +2
The OI 777 nm triplet is a key diagnostic of oxygen abundances in the atmospheres of FGK-type stars; however it is sensitive to departures from local thermodynamic equilibrium (LTE…
Inelastic e+Mg collision data and its impact on modelling stellar and supernova spectra
P. S. Barklem, Y. Osorio, D. V. Fursa +4
Results of calculations for inelastic e+Mg effective collision strengths for the lowest 25 physical states of Mg I (up to 3s6p 1P), and thus 300 transitions, from the convergent cl…
Benchmark calculations for electron-impact excitation of Mg
K. Wang, L. Fernández-Menchero, O. Zatsarinny +1
There are major discrepancies between recent B-spline R-matrix (BSR) and Dirac Atomic R-matrix Code (DARC) calculations regarding electron-impact excitation rates for transitions i…
Electron-impact excitation of N using the B-spline R-matrix method: Importance of the target structure description and the size of the close-coupling expansion
L. Fernández-Menchero, O. Zatsarinny, K. Bartschat
There are major discrepancies between recent ICFT (Intermediate Coupling Frame Transformation) and DARC (Dirac Atomic R-matrix Code) calculations (Fernández-Menchero et al. 2014, A…
Quantum-mechanical calculations of cross sections for electron collisions with atoms and molecules
Klaus Bartschat, Jonathan Tennyson, Oleg Zatsarinny
An overview of quantum-mechanical methods to generate cross-section data for electron collisions with atoms and molecules is presented. Particular emphasis is placed on the time-in…
Calculations for electron-impact excitation and ionization of beryllium
Oleg Zatsarinny, Klaus Bartschat, Dmitry V. Fursa +1
The B-spline R-matrix and the convergent close-coupling methods are used to study electron collisions with neutral beryllium over an energy range from threshold to 100 eV. Coupling…
Effective collision strengths between Mg I and electrons
T. Merle, F. Thévenin, O. Zatsarinny
The treatment of the inelastic collisions with electrons and hydrogen atoms are the main source of uncertainties in non-Local Thermodynamic Equilibrium (LTE) spectral line computat…
Time delays for attosecond streaking in photoionization of neon
Johannes Feist, Oleg Zatsarinny, Stefan Nagele +5
We revisit the time-resolved photoemission in neon atoms as probed by attosecond streaking. We calculate streaking time shifts for the emission of 2p and 2s electrons and compare t…
A Comprehensive X-ray Absorption Model for Atomic Oxygen
T. W. Gorczyca, M. A. Bautista, M. F. Hasoglu +9
An analytical formula is developed to represent accurately the photoabsorption cross section of O I for all energies of interest in X-ray spectral modeling. In the vicinity of the…
Time-Dependent B-Spline R-Matrix Approach to Double Ionization of Atoms by XUV Laser Pulses
Xiaoxu Guan, O Zatsarinny, C J Noble +2
We present an {\it ab initio} and non-perturbative time-dependent approach to the problem of double ionization of a general atom driven by intense XUV laser pulses. After using a h…
A B-spline Galerkin method for the Dirac equation
Charlotte Froese Fischer, Oleg Zatsarinny
The B-spline Galerkin method is investigated for the simple eigenvalue problem, . Special attention is give to boundary conditions. From this analysis, w…
A general approach to few-cycle intense laser interactions with complex atoms
X. Guan, O. Zatsarinny, K. Bartschat +3
A general {\it ab-initio} and non-perturbative method to solve the time-dependent Schrödinger equation (TDSE) for the interaction of a strong attosecond laser pulse with a general…
Dielectronic recombination data for dynamic finite-density plasmas I. Goals and methodology
N. R. Badnell, M. G. O'Mullane, H. P. Summers +7
A programme is outlined for the assembly of a comprehensive dielectronic recombination database within the generalized collisional--radiative (GCR) framework. It is valid for model…
Assessment of the Fluorescence and Auger Data Base used in Plasma Modeling
T. W. Gorczyca, C. N. Kodituwakku, K. T. Korista +5
We have investigated the accuracy of the 1s-vacancy fluorescence data base of Kaastra & Mewe (1993, A&AS, 97, 443) resulting from the initial atomic physics calculations and the su…