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Titolo:
THE WATER-ADSORPTION ON THE SI(111)7X7 SURFACE - A THEORETICAL-STUDY
Autore:
EZZEHAR H; STAUFFER L; LECONTE J; MINOT C;
Indirizzi:
UNIV PARIS 06,CNRS,UPR 9070,CHIM THEOR LAB,BOITE 137 TOUR 23-22 P114,4 PL JUSSIEU F-75252 PARIS 05 FRANCE UNIV PARIS 06,CNRS,UPR 9070,CHIM THEOR LAB F-75252 PARIS 05 FRANCE FAC SCI & TECH,CNRS,URA 1435,LAB PHYS & SPECT ELECT F-68093 MULHOUSE FRANCE
Titolo Testata:
Surface science
fascicolo: 1-3, volume: 388, anno: 1997,
pagine: 220 - 230
SICI:
0039-6028(1997)388:1-3<220:TWOTSS>2.0.ZU;2-N
Fonte:
ISI
Lingua:
ENG
Soggetto:
ELECTRON-ENERGY-LOSS; SILICON SURFACES; RECONSTRUCTED SURFACE; DESORPTION-KINETICS; SI(100) SURFACES; H-2 DESORPTION; INITIAL-STAGES; DAS MODEL; H2O; CHEMISORPTION;
Keywords:
CHEMISORPTION; EHT; SEMIEMPIRICAL MODELS AND MODEL CALCULATIONS; SI(111)7X7; SURFACE STRUCTURE; WAFER;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
50
Recensione:
Indirizzi per estratti:
Citazione:
H. Ezzehar et al., "THE WATER-ADSORPTION ON THE SI(111)7X7 SURFACE - A THEORETICAL-STUDY", Surface science, 388(1-3), 1997, pp. 220-230

Abstract

We present a theoretical study of the initial steps of the water adsorption on Si(111)7x7. Water dissociates on the surface. In a first step, partial dissociation generates the radical species H-. and HO. which are adsorbed on the dangling bonds of the surface. The first sites to be saturated are those of adatoms from the faulted half of the Si(111)7x7 unit cell. When three molecules per unit cell are adsorbed, one rest-atom site is involved together with adatom sites and the adsorption implies an electron transfer from one unit cell to another. For thesubsequent adsorptions, a rest-atom site is involved simultaneously with an adatom site. The OH. goes on the rest-atom site since H-., which is more selective, goes preferentially on the adatom site. Complete dissociation of H2O seems to be even more favorable. Water adsorption can displace the adsorbed hydrogen atoms, initiating an oxidative process. (C) 1997 Elsevier Science B.V.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 02/12/20 alle ore 18:14:14