[ital K]-shell ionization of atoms by electron and positron impact

In the plane-wave Born approximation (PWBA), scaling relations for [ital K]-shell generalized oscillator strengths and energy-loss cross sections of atoms are given. The total [ital K]-shell ionization cross sections, obtained at high impact energy, are used to obtain the Bethe collisional parameter...

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Bibliographic Details
Published in:Physical review. A, Atomic, molecular, and optical physics Atomic, molecular, and optical physics, 1993-08, Vol.48:2
Main Authors: Khare, S.P., Saksena, V., Wadehra, J.M.
Format: Article
Language:English
Subjects:
664300 - Atomic & Molecular Physics- Collision Phenomena- (1992-)
ATOM COLLISIONS
ATOMIC AND MOLECULAR PHYSICS
BORN APPROXIMATION
COLLISIONS
ELECTRON COLLISIONS
ELECTRON-ATOM COLLISIONS
ELECTRONIC STRUCTURE
ENERGY LOSSES
IONIZATION
K SHELL
LOSSES
OSCILLATOR STRENGTHS
POSITRON COLLISIONS
POSITRON-ATOM COLLISIONS
SCALING LAWS
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Summary:In the plane-wave Born approximation (PWBA), scaling relations for [ital K]-shell generalized oscillator strengths and energy-loss cross sections of atoms are given. The total [ital K]-shell ionization cross sections, obtained at high impact energy, are used to obtain the Bethe collisional parameter [ital c][sub [ital K]] for atoms ranging from carbon to gold. These values of [ital c][sub [ital K]] are, in general, significantly different from those obtained previously with the help of Fano plots at relatively low impact energies. Furthermore, using Hippler's modification of the PWBA [Phys. Lett. A 144, 81 (1990)], total [ital K]-shell ionization cross sections of various atoms by electron and positron impact are calculated over a wide energy range. The electron-impact ionization cross sections for light atoms are in satisfactory agreement with the experimental data.
ISSN:1050-2947
1094-1622
DOI:10.1103/PhysRevA.48.1209