Doubly-differential-cross-section calculations forK-shell-vacancy production in lithium by fastO8+-ion impact

Abstract

Inner-shell vacancy production for the O 8+ -Li collision system at 1.5 MeV/amu is studied theoretically. The theory combines single-electron amplitudes for each electron in the system to extract multielectron information about the collision process. Doubly differential cross sections obtained in this way are then compared with the recent experimental data by A. C. LaForge et al. [J. Phys. B 46, 031001 (2013)], yielding good resemblance, especially for low outgoing electron energy. A careful analysis of the processes that contribute to inner-shell vacancy production shows that the improvement of the results as compared to single-active-electron calculations can be attributed to the leading role of two-electron excitation-ionization processes.

Comparison of experimental and theoretical fully differential cross sections for single ionization of the2sand2pstates of Li byO<

“…However, the experimental data for a lithium target were only recently reported. As a result, theoretical studies have also recently started to shift focus from helium to lithium [47][48][49][50][51][52]. In this article, we present a comprehensive comparison between experiment and theory covering a broad range of kinematic parameters for ionization both from the ground state and from the 2p state.…”

Fully differential cross sections for ionization of Li(2s) and Li(2p) by 16 MeV Li2+ impact

“…The FDCS for 2p −1 is close to that of the experimental population, since it is dominated by that of 2p −1 . The FDCSs of 2p x , 2p y and 2p z are symmetric with respect to f e =0°, see equation (10). The FDCSs for 2p x show maximum or local minimum at f e =0°.…”

“…The method was first applied to investigate ionization of the 2s and 2p states of the lithium atom. The doubly differential cross sections for the Li targets with respect to the electron ejection energy and the transverse momentum transfer were measured for 24 MeV O 8+ and 6 MeV proton impacts [6], which were analyzed by theoretical calculations [7][8][9][10][11]. Measurements for the FDCS were also reported for the 24 MeV O 8+ and 16 MeV Li 2+ impacts [12][13][14][15].…”

Doubly differential cross sections for ionization of lithium atom by protons and O8+ ions

“…The role of multielectron processes was investigated in Refs. [10,11] also within the Correspondence to: bondarev@spbstu.ru CDW-EIS framework. In the latter paper, the CDW-EIS approach was used in combination with the two-center basis generator method [12].…”