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Metallic bond effects on mean excitation energies for stopping powersMean excitation energies for first row metals are evaluated by means of the local plasma approximation. Particle corrections based on Pines' (1953) procedure and the Wigner Seitz (1934) model of the metallic state are included. The agreement with experimental values is remarkably good. In contrast to previous work, the calculations given here estimate shifts in the plasma frequency according to the theory for plane wave states in an extended plasma as calculated by Pines. It is demonstrated that the effects of the metallic bond in lithium and beryllium are quite large and that they appear mainly as a result of collective oscillations in the 'free' electron gas formed from the valence electrons. The usefulness of the plasma frequency shift derived for a degenerate electron gas in predicting the plasma frequency shift within the ion core is considered surprising.
Document ID
19820056367
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Wilson, J. W.
(NASA Langley Research Center Hampton, VA, United States)
Xu, Y. J.
(Old Dominion University Norfolk, VA; Chinese Academy of Sciences, Institute of Applied Mathematics, Beijing, People's Republic Of China)
Date Acquired
August 10, 2013
Publication Date
July 12, 1982
Publication Information
Publication: Physics Letters
Volume: 90A
Subject Category
Atomic And Molecular Physics
Accession Number
82A39902
Distribution Limits
Public
Copyright
Other

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