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Electron impact ionization; binary encounter approximation; Hartree-Fock momentum distribution; copper

Electron impact single ionization cross sections of copper have been calculated in the binary encounter approximation using accurate expression for σ_ΔE as given by Vriens and Hartree-Fock momentum distribution for the target electron. The BEA calculation based on the usual procedure does not show satisfactory agreement with experiment in this case but a striking modification is found to be successful in explaining the experimental observations. The discrepancy is linked with the ionization of the 3d¹⁰ electrons and probably effective single ionization does not take place from 3d shell of copper leading to smaller values of experimental cross sections.

L K Jha¹ O P Roy² B N Roy³

1. Department of Physics, L.N.T. College, Muzaffarpur - 842 002, India
2. Department of Physics, M.S.K.B. College, Muzaffarpur - 842 002, India
3. Aghoria Bazar, Muzaffarpur - 842 002, India

Published

September 2000

Manuscript received

15 June 1999

Manuscript revised

23 August 2000