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Title:
Momentum-density effects upon the electronic stopping of elemental solids
Authors:
Wang, J.; Mathar, Richard J.; Trickey, S. B.; Sabin, John R.
Affiliation:
Quantum Theory Project, Department of Physics, University of Florida, Gainesville, FL 32611-8435, USA
Publication:
Journal of Physics: Condensed Matter, Volume 11, Issue 20, pp. 3973-3985 (1999).
Publication Date:
05/1999
Origin:
IOP
DOI:
10.1088/0953-8984/11/20/304
Bibliographic Code:
1999JPCM...11.3973W

Abstract

Treatment of electronic stopping via kinetic theory and the orbital local plasma approximation is extended (from free-standing ordered slabs) to include bulk crystalline targets, and hence probe their electron momentum distribution. Sensitive computational issues, important for comparison with experimental data, are addressed. A primary result is unambiguous first-principles prediction of large gas-solid and film-solid differences in Li stopping. Previous predictions had involved semi-empirical determination of mean excitation energies. Additionally, a stopping anisotropy that is separate from and much smaller than familiar channelling and related to the familiar Compton-profile anisotropy is treated, apparently for the first time. Example calculations for hexagonal Li and graphite are given.
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