Interaction of atomic hydrogen with the beta-SiC(100) 3 x 2 surface and subsurface.
J Chem Phys
; 127(16): 164716, 2007 Oct 28.
Article
em En
| MEDLINE
| ID: mdl-17979380
ABSTRACT
We investigate clean and atomic hydrogen exposed beta-SiC(100) 3 x 2 surfaces by synchrotron radiation-based Si 2p core-level photoemission spectroscopy. The clean 3 x 2 surface reconstruction exhibits three surface and subsurface components. Upon hydrogen exposures, those surface and subsurface components are shifted to lower binding energies by large values, indicating significant charge transfer to the surface and subsurface regions, in excellent agreement with the recently discovered H-induced beta-SiC(100) 3 x 2 surface metallization. In addition, the interaction of hydrogen results in a large reactive component at Si 2p supporting an asymmetric charge transfer in the third plane below the surface, in agreement with previous experimental investigations. However, the results are inconsistent with recent ab initio theoretical "frozen" calculations predicting H atom to be in a bridge-bond position.
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01-internacional
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MEDLINE
Idioma:
En
Ano de publicação:
2007
Tipo de documento:
Article