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Titolo:
SFG study of unstable surface species by picosecond pump-probe method
Autore:
Domen, K; Bandara, A; Kubota, J; Onda, K; Wada, A; Kano, SS; 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 Hosei Univ, Coll Engn, Koganei, Tokyo 184, Japan Hosei Univ Koganei TokyoJapan 184 , Coll Engn, Koganei, Tokyo 184, Japan
Titolo Testata:
SURFACE SCIENCE
, volume: 428, anno: 1999,
pagine: 349 - 357
SICI:
0039-6028(19990601)428:<349:SSOUSS>2.0.ZU;2-Y
Fonte:
ISI
Lingua:
ENG
Soggetto:
ELECTRON-ENERGY LOSS; FORMIC-ACID DECOMPOSITION; LASER-INDUCED DESORPTION; REACTION-KINETICS; LOSS SPECTROSCOPY; NI(110) SURFACE; FORMATE; ADSORPTION; IRAS; RU(001);
Keywords:
formate on NiO(111) and Ni(111); laser-induced temperature jump; short-lived reactive intermediates; time-resolved sum-frequency generation (TR-SFG) spectroscopy;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
42
Recensione:
Indirizzi per estratti:
Indirizzo: Domen, K 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:
K. Domen et al., "SFG study of unstable surface species by picosecond pump-probe method", SURF SCI, 428, 1999, pp. 349-357

Abstract

We succeeded in identifying the intermediates in thermal decomposition reactions by utilizing the combination of an instantaneous temperature jump induced by the irradiation of picosecond laser pulses and the subsequent observation by time-resolved sum-frequency generation (TR-SFG) spectroscopy. The short-lived reactive intermediates in the decomposition of formats on NiO(111) and Ni(111) surfaces were identifie. The irradiation of 1064 nm laserpulses caused the vibrational peak of the C-D stretching mode v(CD) of bidentate formate on NiO(111) to weaken and the v(CD) band of monodentate formate to appear. The result on Ni(111) showed the weakening of the v(CD) bandof bridging formate and the appearance of the C=O stretching mode v(C=O) of monodentate formate. The spectral changes recovered on a 100 ps time scale but not fully above 400 K for the NiO(111) system and 320 K for the Ni(111) system, indicating the onset of thermal decomposition in the high-temperature period. The observations suggested that the formate in the stable bidentate/bridging configurations transformed to unstable monodentate formats prior to decomposition. Temperature- and time-dependent features indicated that the two types of formate were in equilibrium and the equilibrium shifted towards the monodentate form by the rapid laser-induced temperature jumpof about 250-300 K. (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 29/09/20 alle ore 20:25:26