Accession Number : AD0687896

Title :   THEORY OF AUGER EJECTION OF ELECTRONS FROM METALS BY IONS,

Corporate Author : TORONTO UNIV (ONTARIO) INST FOR AEROSPACE STUDIES

Personal Author(s) : Wenaas,Eric P. ; Howsmon,A. J.

Report Date : MAR 1969

Pagination or Media Count : 91

Abstract : A theory of the ejection of electrons from atomically clean metals by slow ions of the noble gases arising from Auger transitions is presented. Scattering matrix elements are evaluated from first principles and the secondary ejected electron energy distribution and total yield are found. The approach used in the solution of this problem is that of the quantum theory of scattering. This approach eliminates determining transition matrix elements per unit time as a function of the distance of the ion from the metal surface, and will allow the direct calculation of the secondary electron energy distribution, total yield, spatial distribution, position of most probable neutralization, and depth of origination of Auger electrons. The formal solution is applied to the situation of He(+) ions of low energy incident on atomically clean tungsten. Normal incidence is treated although the theory is not restricted to this case. Typical theoretical curves are presented and compared with the experimental results of others. A discussion of such effects as energy broadening, effective ionization energy, uncertainty principle effects, inelastic electron scattering, and density of electron states in metals is included. (Author)

Descriptors :   (*SECONDARY EMISSION, THEORY), (*ION BEAMS, SECONDARY EMISSION), ELECTRONS, RARE GASES, WAVE FUNCTIONS, SCATTERING, THESES, CANADA

Subject Categories : Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE