Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
Time-resolved SFG study of the vibrational excitation of adsorbed CO on Ni(111) and NiO(111) surfaces under the irradiation of UV and visible photons
Autore:
Bandara, A; Kubota, J; Onda, K; Wada, A; Kano, SS; Domen, K; Hirose, C;
Indirizzi:
Tokyo Inst Technol, Res Lab Resources Utilizat, 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: 331 - 336
SICI:
0039-6028(19990601)428:<331:TSSOTV>2.0.ZU;2-B
Fonte:
ISI
Lingua:
ENG
Soggetto:
CO(V=1) POPULATION LIFETIMES; CARBONYL CLUSTER COMPOUNDS; INDUCED DESORPTION; INFRARED-SPECTROSCOPY; DYNAMICS; ADSORPTION; GENERATION; NO; CO/PT(111); NO/PT(111);
Keywords:
CO on Ni(111) and NiO(111); hot electrons; sum-frequency generation (SFG); upsilon=2 <- 1 hot band; vibrational excitation by UV and visible photons;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
28
Recensione:
Indirizzi per estratti:
Indirizzo: Hirose, C Tokyo Inst Technol, Res Lab Resources Utilizat, Midori Ku, 4259 Nagatsuta,Yokohama, Kanagawa 2268503, Japan Tokyo Inst Technol 4259 Nagatsuta Yokohama Kanagawa Japan 2268503
Citazione:
A. Bandara et al., "Time-resolved SFG study of the vibrational excitation of adsorbed CO on Ni(111) and NiO(111) surfaces under the irradiation of UV and visible photons", SURF SCI, 428, 1999, pp. 331-336

Abstract

The effects of irradiation by picosecond ultraviolet (266 nm) and visible (532 nm) pulses of GO-covered Ni(111) and NiO(111)/Ni(111) surfaces were investigated by infrared-visible sum-frequency generation (SFG) spectroscopy. As a result of the irradiation of UV pulses, the SFG signal by the v = 1 <-- 0 bands of the CO stretching mode weakened and transient peaks tentatively assigned to the v = 2 <-- 1 hot band transition appeared with a downshift by 18 and 14 cm(-1) from v = 1 <-- 0 bands on the metal and oxide-layeredsurfaces, respectively. The time profile of the weakening and that of the transient signal were coincident with the same rise and fall times of less than similar to 10 ps. The irradiation of visible pulses also induced a weakening of the v = 1 <-- 0 bands and transient peaks, but the decay time on the metal surface was longer than 100 ps, The temporal and spectral features imply that the persistent v = 1 <-- 0 band and the transient band originated from the same CO molecule. Short decay times observed on irradiating UVpulses on to the N(111) and NiO(111) surfaces and that of the visible pulses on to the NiO(111) surface suggest that the photogenerated hot electronsinduced the observed spectral changes. The long decay time observed on irradiating visible pulses on to the Ni(111) surface suggests the occurrence of a thermally driven process. Participation of the negative ion state was considered to be one of the possible mechanisms for the rapidly decaying features. (C) 1999 Elsevier Science B.V. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 26/09/20 alle ore 13:58:29