CDW and CDW-EIS calculations for FDCSs in highly charged ion impact ionization of helium

Abstract

In this work we present fully differential cross sections (FDCS) calculations using CDW and CDW-EIS theories for helium single ionization by 100 MeV/amu and 2 MeV/amu C 6+ and 3.6 MeV/amu Au 24+ and Au 53+ ions. We performed our calculations for different momentum transfers and ejected electron energies. We study the influence of the internuclear potential on the ejected electron spectra. We discuss different regimes where the internuclear interaction can or cannot be neglected. We compare our calculations with experimental data available. It is shown that for high impact energy and small momentum transfer, internuclear potential effects can be neglected in FDCSs.

Total single electron capture cross sections for collisions of multicharged ions with He atoms

“…The three-body continuum distorted waveeikonal initial state method (CDW-EIS-3B) and three-body continuum distorted wave-eikonal final state method (CDW-EFS-3B) have been used in [15,16] to calculate the single electron capture cross sections for collisions between bare heavy ions and helium atoms. Ciappina et al [10][11][12] have applied the CDW-EIS both in post and prior forms to study the single-electron-ionization cross sections from He atoms by multiply-charged ions. In both the prior and post version calculations, they have applied Rothaan-Hartree-Foch 5-z function [41] for the initial state and in the final state the active target electron moves in the combined Coulomb field of the target core with different values of the effective nuclear charge.…”

“…The calculated results show excellent agreement with the experiments except in the low energy region. In most of the above mentioned theoretical studies [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17] and also other papers, the total cross sections have been computed and compared with the available experimental data, since most of experimental data for the total cross sections in collisions of fast multiply-charged ions with helium atoms are for the total cross sections. A great review of the three-and four-body methods is found in [39,40].…”