✦ LIBER ✦

Photoelectric cross sections and multi-electron transitions in the sudden approximation

✍ Scribed by C.S. Fadley

Publisher: Elsevier Science
Year: 1974
Tongue: English
Weight: 612 KB
Volume: 25
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(74)89123-2

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✦ Synopsis

Within the usual assumptions associated with sudden-approximation analyses of photoelectron spectm. it is shown that unrelaxed subshell cross sections calculated on the basis of unit overlap between initial-and final-state-passive electrons implicitly include the effects of both one-electron and multi-electron transitions. Such cross sections therefore need not be directly related to the intensities of the one-electron transition peaks discernible in X-ray photoelectron spectroscopy (XPS), but should describe the processes associated with soft-X-ray absorption coefficient measure: ments well above threshold. The latter prediction is consistent with available comparisons between experiment and theory. The relationship of XPS peak intensities and their ratios to unrelaxed cross sections is also discussed within this approximation.

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