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Titolo:
An in situ surface differential diffraction and anomalous scattering investigation of surface relaxation during underpotential deposition of Ag on Au(111)
Autore:
Ramadan, AR; Chabala, ED; Rayment, T;
Indirizzi:
Univ Cambridge, Dept Chem, Cambridge CB2 1EW, England Univ Cambridge Cambridge England CB2 1EW hem, Cambridge CB2 1EW, England
Titolo Testata:
PCCP PHYSICAL CHEMISTRY CHEMICAL PHYSICS
fascicolo: 7, volume: 1, anno: 1999,
pagine: 1591 - 1596
SICI:
1463-9076(19990401)1:7<1591:AISSDD>2.0.ZU;2-J
Fonte:
ISI
Lingua:
ENG
Soggetto:
X-RAY-DIFFRACTION; SCANNING-TUNNELING-MICROSCOPY; METAL-ELECTROLYTE INTERFACES; IN-SITU; ATOMIC FORCE; REAL-TIME; AQUEOUS-SOLUTION; SILVER; RECONSTRUCTION; MONOLAYERS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
38
Recensione:
Indirizzi per estratti:
Indirizzo: Rayment, T Univ Cambridge, Dept Chem, Lensfield Rd, Cambridge CB2 1EW, England Univ Cambridge Lensfield Rd Cambridge England CB2 1EW England
Citazione:
A.R. Ramadan et al., "An in situ surface differential diffraction and anomalous scattering investigation of surface relaxation during underpotential deposition of Ag on Au(111)", PCCP PHYS C, 1(7), 1999, pp. 1591-1596

Abstract

An in situ X-ray diffraction investigation, using surface differential diffraction (SDD) and anomalous scattering, has been carried out to study relaxation of the substrate surface occurring during the underpotential deposition of silver onto the Au(lll) surface. Although the SDD profile is affected by all structural changes at the surface, only a single structural parameter may be extracted from a single differential profile. However if data are collected at a number of different wavelengths then the variation of scattering factors may be used to distinguish relaxation of the substrate from adsorption. Data were collected at three different wavelengths lambda(1), =1.499 Angstrom (30 eV below the Ni edge), lambda(2) = 1.073 Angstrom (200 eV below the Au edge), and lambda(3) = 1.045 Angstrom (30 eV below the Au edge). Combined analysis of this data shows that during underpotential adsorption of silver the surface gold layer undergoes a compressive relaxation of 0.10 Angstrom which is in agreement with values reported in the literature. This shift was found to be independent of potential variation.

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Documento generato il 05/12/20 alle ore 00:50:53