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Autoionization and energy-loss structures in Nb and Mo clean and oxygen-exposed surfaces

Autoionization and energy-loss structures in Nb and Mo clean and oxygen-exposed surfaces

Authors :
A. Amoddeo
E. Colavita
Raffaele Giuseppe Agostino
Vincenzo Formoso
Assunta Bonanno
Gennaro Chiarello
Lorenzo S. Caputi
Source :
Surface Science. :481-488
Publication Year :
1989
Publisher :
Elsevier BV, 1989.

Abstract

Autoionization features have been observed in Nb and Mo surfaces above the N23VV Auger lines. Similarly to 3d transition metals, they are interpreted as due to a coherent decay of the excited 4p electron and to a subsequent interference effect with the direct photoexcitation channel from the valence band. If the radial dependence of the 4d wavefunction does not vary strongly across the band, the line shape of the autoionization electron emission is expected to be similar to the core-energy loss result from 4p core levels. The correspondence between secondary electron emission and energy loss backscattering yield has been studied for both the clean and oxygen-exposed surfaces. A close similarity is found between the electron-induced phenomena observed above the N23VV Auger lines and the N23 core absorption.

Details

ISSN :
00396028
Database :
OpenAIRE
Journal :
Surface Science
Accession number :
edsair.doi.dedup.....1b709193592806ac4d9e07e3a6a86df6
Full Text :
https://doi.org/10.1016/0039-6028(89)90805-4