Atomic origins of the Si 2p surface core-level shifts of the “prototypical” -Ag structure
CRMC2-CNRS, Campus de Luminy - Case 913, F-13288 Marseille Cedex 09, France
2 Istituto di Struttura della Materia del CNR, via Fosso del Cavaliere I-00133 Roma, Italy
Accepted: 29 October 1998
High-resolution core-level spectra from the -Ag surface considered as a standard in surface science have been obtained at 100 K. The sharp Si 2p spectra comprise three asymmetric surface-shifted components, pointing to a metallic character of the surface. The strong S1 component due to the Si first layer atoms bonded to the adsorbed Ag atoms is shifted to higher binding energy. This challenges the theoretical prediction of a large charge transfer from the Ag atoms to this top Si layer and points to the importance of final-state effects in the interpretation of the Si 2p spectra.
PACS: 73.20.-r – Surface and interface electron states / 79.60.-i – Photoemission and photoelectron spectra
© EDP Sciences, 1999