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Mean excitation energies for stopping powers in various materials composed of elements hydrogen through argonThe local plasma model is used to study the effects of the chemical and physical state of a medium on its stopping power. The relationship between that model and a more exact quantum treatment of bound systems is elucidated by examining related quantities in both theories for the case of one and two-electron systems. Atomic mean excitation energies and straggling parameters in the local plasma model are compared with the accurate calculations of Inokuti et al. (1975, 1978, 1981). The use of the Gordon-Kim electron gas model of molecular bonding is used to determine the effects of covalent chemical bond shifts on the mean excitation energies for elements of the first two rows. Calculations of mean excitation energies of ionic bonded substances are presented, and the mean excitation energies of metals are discussed.
Document ID
19840056145
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 Republ, United States)
Kamaratos, E.
(NASA Langley Research Center Hampton, VA, United States)
Chang, C. K.
(Christopher Newport College Newport News, VA, United States)
Date Acquired
August 12, 2013
Publication Date
July 1, 1984
Publication Information
Publication: Canadian Journal of Physics
Volume: 62
ISSN: 0008-4204
Subject Category
Atomic And Molecular Physics
Accession Number
84A38932
Funding Number(s)
CONTRACT_GRANT: NSG-1614
CONTRACT_GRANT: NCC1-42
Distribution Limits
Public
Copyright
Other

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