Differential probability for surface and volume electronic excitations in Fe, Pd and Pt

SURFACE SCIENCE

卷:588

Article

Werner, WSM

关键词: reflection electron energy loss spectroscopy (REELS);    electron;    scattering;    inelastic;    surface;    volume;    dielectric function;   

DOI  :  10.1016/j.susc.2005.05.023

来源: Elsevier

【 摘 要 】

The normalized differential mean free path for volume scattering, and the differential surface excitation probability for medium energy electrons travelling in Fe, Pd and Pt are extracted front reflection electron energy loss spectra (REELS). This was achieved by means of it recently introduced procedure in which two REELS spectra taken under different experimental conditions are Simultaneously deconvoluted, In this ay, it is possible to obtain the unique reconstruction for the surface and volume single scattering loss distribution, The employed method is compared with it procedure that is frequently used for this purpose [S. Tougaard, I. Chorkendorff. Phys, Rc, B 35 (1987) 6570], It is shown. both theoretically and through analysis of model spectra its well as experimental data that the approach by Tougaard and Chorkendorff does not result in a single scattering loss distribution. Rather, it gives it mixture of surface, bulk and mixed scattering of any order. (c) 2005 Published by Elsevier B.V.

【 授权许可】

Free