Coupled subshell description of the L-shell ionization in asymmetric ion-atom collisions

doi:10.1016/0168-583X(91)95961-C

Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms

Volumes 56–57, Part 1, 1 May 1991, Pages 21-25

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Abstract

L-subshell ionization cross sections for collisions of Be, C, F, Mg, Si and S ions with Au and Th m the energy range of 0.5–2.5 MeV/amu are calculated within the coupled Subshell approximation and compared to the experimental data. Fair agreement is obtained once the matrix elements of the projectile perturbing potential are renormalized to account for the screening due to the target spectator electrons. The present calculations provide the first consistent description of the direct Coulomb ionization and vacancy sharing among the L-subshells during an asymmetric ion-atom collision. The remaining discrepancies suggest further complexity inherent to such a process.

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Data for available L-subshell ionization caused by slow and heavy ions (Z₁ = 6, 7 and 8) are compiled and compared with the prdictions of the ECPSSR theory with and without the intra-shell (IS) coupling. It has been observed that the standard ECPSSR without Is is inadequate to predict quantitatively the L-subshell cross section data at low projectile velocities. The inclusion of the IS effect somewhat worsens agreement with experiment for the L₁-subshell ionization, substantially improves it for the L₂ subshell, and plays essentially no role in an analysis of L₃-subshell data which are fairly well predicted by the standard ECPSSR theory. The quantitative validity of such conclusions may be questioned because they rely on an approximate treatment of the IS effect.
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L-subshell ionization cross sections for selected heavy elements between La and Au were measured for ¹⁴N ions in the energy range 1.75–22.4 MeV. The L-X-ray yields were corrected for a substantial projectile energy-loss in the target, being up to 20% for the lowest energies, and the X-ray absorption effect. The measured L-subshell ionization cross sections are compared with the predictions of the ECPSSR theory for direct ionization and electron capture processes and the SCA calculations for direct ionization. Both theories underestimate the data for L₂-subshell for the lowest energies. This is attributed to the effect of intra-shell transitions not accounted for in both calculations. Systematic overestimation of measured L₃-subshell cross sections by the theories is also found for higher scaled velocities ξ > 0.5, where the binding-polarization effects are expected to play an important role.
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^☆: Work supported in part by Internationales Bureau, Kernforschungszentrum Karlsruhe.

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Coupled subshell description of the L-shell ionization in asymmetric ion-atom collisions☆

Abstract

J. Phys.

J. Phys.

J. Phys.

J. Phys. Soc. Jpn.

J. Phys.

J. Phys.