Short-lived reactive formate species on NiO(111) observed by picosecond temperature jump

Athula Bandara, Jim Kubota, Ken Onda, Akihide Wada, Kazunari Domen, Chiaki Hirose

研究成果: Contribution to journalConference article査読

14 被引用数 (Scopus)

抄録

The combination of an instantaneous temperature jump induced by the irradiation of picosecond laser pulses and the subsequent observation by sum-frequency generation spectroscopy enabled the identification of a short-lived reactive intermediate in the decomposition of formate on NiO(111) surface. The irradiation of 1064 nm laser pulses caused the vibrational peak at 2160 cm-1, which is the C-D stretching mode vCD of bidentate formate, to weaken and the vCD of monodentate formate at 2190 cm-1 to appear. The spectral changes recovered in 100 ps time scale but not fully above 400 K. The observations suggested that the formate in bidentate configuration transformed to monodentate formate 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 a rapid laser-induced temperature jump of about 250-300 K. The experiment enabled us to identify short-lived species and to estimate kinetic parameters. The enthalpy difference between bidentate and monodentate formates and the activation energy for the decomposition of monodentate formate were 19 ± 5 and 30 ± 10 kJ/mol, respectively.

本文言語英語
ページ(範囲)83-87
ページ数5
ジャーナルSurface Science
433
DOI
出版ステータス出版済み - 8 2 1999
外部発表はい
イベントProceedings of the 1998 14th International Vacuum Congress(ICV-14), 10th Conference on Solid Surfaces(ICSS-10), 5th Conference on Nanometre-scale Science and Technology(NANO-5), 10th International Conference on Quantitative Surface Analysis(QSA-10) - Birmingham, UK
継続期間: 8 31 19989 4 1998

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry

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