Electron Effective Attenuation Lengths in Electron Spectroscopies

Published

January 1, 2004

Author(s)

Aleksander Jablonski, Cedric J. Powell

Abstract

An important measure of the opacity of a solid with respect to monoenergetic electrons in a solid is the effective attenuation length (EAL). However, there is much controversy in the literature concerning the definition of this parameter. It has been shown recently that different quantitative applications of electron spectroscopies require EALs resulting from different expressions. In the present report, these expressions for typical applications of X-ray photoelectron spectroscopy (XPS) and Auger electron spectroscopy are briefly reviewed. The EALs needed for determination of overlayer thicknesses and for measurement of surface composition are compared for the same experimental configuration. These comparisons are made for selected photoelectron lines for which we expect strong electron elastic-scattering effects (Cu 2s and Cu 2p3/2 in Cu and Au 4s and Au 4f7/2 in Au). Substantial differences between EALs for these lines were found for the two applicatons. Synchrotron radiation may be used for experimental determination of the EAL values. These values can facilitate evaluation of the reliability of theoretical models used in calculations of EALs.

Citation

Journal of Alloys and Compounds

Volume

363

Issue

No. 1-2

Pub Type

Journals

Keywords

Auger electron spectroscopy, copper, effective attenuation length, elastic scattering, electron scattering, gold, x-ray photoelectron spectroscopy

Citation

Jablonski, A. and Powell, C. (2004), Electron Effective Attenuation Lengths in Electron Spectroscopies, Journal of Alloys and Compounds (Accessed October 31, 2024)