The Atomic Physics Processes Group at Vilnius University investigates, theoretically, numerous atomic processes including electron-ion collisions, photon-induced processes, radiative and Auger spectra.
The study of electron impact ionization includes direct and indirect ionization processes. Electron impact excitation and electron capture with subsequent double Auger transitions are included in the investigation of the indirect process of the ionization. The scaled distorted wave approach was introduced to study ionization cross sections for neutral atoms and near neutral ions. The configuration interaction strength is used to estimate basis of interacting configurations and to analyze correlation effects which can be crucial in the ionization process.
Multiple photoionization produced by inner shell photoionization with subsequent radiative and Auger cascade is investigated for elements important in laboratory and astrophysical plasmas, and medicine.
The radiative and Auger cascades produced by creation of the inner-shell vacancy are explicitly analyzed for levels and subconfigurations. Time-dependent analyses of the cascades reveal evolution of formation of charge states and configurations. This information can be important in understanding processes in various environments from astrophysical plasma to biological matter.
Dr Valdas JONAUSKAS
Institute of Theoretical Physics and Astronomy, Vilnius University, Saulėtekio av. 9, III bld., Vilnius, LT-10222, Lithuania Email: email@example.com
 V. Jonauskas, "Electron-impact single ionization of the nitrogen atom", Astronomy & Astrophysics659, A11 (2022). [link to article]
 S. Kučas et al., "Multiple photoionization for the 2p subshell in the iron atom", Monthly Notices of the Royal Astronomical Society514, 1879-1885 (2022). [link to article]
 S. Kučas et al., "Evaluation of radiative and Auger electron emission following K-shell vacancy creation in iodine", Journal of Quantitative Spectroscopy and Radiative Transfer288, 108249 (2022). [link to article]
 A. Kynienė and V. Jonauskas, "Electron-impact ionization of Ar2+", Astronomy & Astrophysics656, A79 (2021). [link to article]
 A. Kynienė et al., "Electron-impact ionization for the levels of Fe3＋", Atomic Data and Nuclear Data Tables142, 101445 (2021). [link to article]
 S. Kučas et al., "Multiple photoionization cross sections for Fe2+ K shell", Astronomy & Astrophysics643, A46 (2020). [link to article]
 V. Jonauskas, "Electron-impact single ionization of Si+", Astronomy & Astrophysics642, A185 (2020). [link to article]
 V. Jonauskas, "Electron impact single ionization for Si atom", Atomic Data and Nuclear Data Tables135-136, 101363 (2020). [link to article]
 V. Jonauskas et al., "Electron-impact ionization of", Physical Review A100, 062701 (2019). [link to article]
 V. Jonauskas, "Electron-impact ionization of Sn4+", Journal of Quantitative Spectroscopy and Radiative Transfer239, 106659 (2019). [link to article]