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Titolo:
Screening of SFG signals from bridged CO on Ni(111) by the coexistence of linear CO
Autore:
Katano, S; Bandara, A; Kubota, J; Onda, K; Wada, A; Domen, K; Hirose, C;
Indirizzi:
Tokyo Inst Technol, Resources Utilizat Res Lab, Midori Ku, Yokohama, Kanagawa 2268503, Japan Tokyo Inst Technol Yokohama Kanagawa Japan 2268503 anagawa 2268503, Japan
Titolo Testata:
SURFACE SCIENCE
, volume: 428, anno: 1999,
pagine: 337 - 342
SICI:
0039-6028(19990601)428:<337:SOSSFB>2.0.ZU;2-6
Fonte:
ISI
Lingua:
ENG
Soggetto:
REFLECTION-ABSORPTION-SPECTROSCOPY; VIBRATIONAL-SPECTRA; ADSORPTION SITES; SURFACE; PT<111>; PT(111);
Keywords:
CO; Ni(111); sum-frequency generation;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
28
Recensione:
Indirizzi per estratti:
Indirizzo: Hirose, C Tokyo Inst Technol, Resources Utilizat Res Lab, Midori Ku, 4259 Nagatsuta,Yokohama, Kanagawa 2268503, Japan Tokyo Inst Technol 4259 Nagatsuta Yokohama Kanagawa Japan 2268503
Citazione:
S. Katano et al., "Screening of SFG signals from bridged CO on Ni(111) by the coexistence of linear CO", SURF SCI, 428, 1999, pp. 337-342

Abstract

A spectroscopic study of adsorbed CO on Ni(111) was carried out using infrared-visible sum-frequency generation (SFG) and infrared reflection absorption spectroscopy (IRAS). An anomalous coverage-dependence of the SFC signalintensities of bridged and linear CO was found. While the SFG signal of bridged CO at 1920 cm(-1) gained intensity with increasing CO coverage in theregion between 0 and 0.4 ML (1 monolayer, ML: saturation coverage at 130 K), it weakened and disappeared when linear CO (2074 cm(-1)) was present on the surface above 0.47 ML. The IRA peak of bridged CO, however, did not disappear at the increased coverage suggesting that the weakening of the SFG signal of bridged CO is not caused by the decrease in the coverage but by the suppression of the SFG process of bridged CO by the coexistence of linearCO. The spectra of isotope mixtures of (CO)-O-16 and (CO)-O-18 clearly indicated that the weakening of SFG signals is not caused by the dipole-dipolecoupling between the vibrational modes of bridged and linear CO. The anomalous coverage-dependence of the SFG signal was ascribed to the change of the Raman tensor by the coadsorption of linear CO. (C) 1999 Elsevier Science B.V. All rights reserved.

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Documento generato il 24/09/20 alle ore 23:43:14