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

Athula Bandara, Jun Kubota, Ken Onda, Akihide Wada, Satoru S. Kano, Kanzunari Domen, Chiaki Hirose

Research output: Contribution to journalConference article

16 Citations (Scopus)

Abstract

The effects of irradiation by picosecond ultraviolet (266 nm) and visible (532 nm) pulses of CO-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-layered surfaces, 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 approx. 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 UV pulses on to the Ni(111) and NiO(111) surfaces and that of the visible pulses on to the NiO(111) surface suggest that the photo-generated hot electrons induced 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.

Original languageEnglish
Pages (from-to)331-336
Number of pages6
JournalSurface Science
Volume427-428
DOIs
Publication statusPublished - Jun 1 1999
Externally publishedYes
EventProceedings of the 1998 9th International Conference on Vibrations at Surfaces (VAS9) - Kanagawa-ken, Jpn
Duration: Oct 12 1998Oct 16 1998

Fingerprint

Carbon Monoxide
Photons
Irradiation
irradiation
photons
pulses
excitation
decay
Metals
Hot electrons
hot electrons
negative ions
Oxides
Stretching
metal surfaces
Negative ions
Spectroscopy
occurrences
Infrared radiation
Molecules

All Science Journal Classification (ASJC) codes

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

Cite this

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. / Bandara, Athula; Kubota, Jun; Onda, Ken; Wada, Akihide; Kano, Satoru S.; Domen, Kanzunari; Hirose, Chiaki.

In: Surface Science, Vol. 427-428, 01.06.1999, p. 331-336.

Research output: Contribution to journalConference article

Bandara, Athula ; Kubota, Jun ; Onda, Ken ; Wada, Akihide ; Kano, Satoru S. ; Domen, Kanzunari ; Hirose, Chiaki. / 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. In: Surface Science. 1999 ; Vol. 427-428. pp. 331-336.
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abstract = "The effects of irradiation by picosecond ultraviolet (266 nm) and visible (532 nm) pulses of CO-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-layered surfaces, 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 approx. 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 UV pulses on to the Ni(111) and NiO(111) surfaces and that of the visible pulses on to the NiO(111) surface suggest that the photo-generated hot electrons induced 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.",
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AU - Bandara, Athula

AU - Kubota, Jun

AU - Onda, Ken

AU - Wada, Akihide

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AU - Domen, Kanzunari

AU - Hirose, Chiaki

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N2 - The effects of irradiation by picosecond ultraviolet (266 nm) and visible (532 nm) pulses of CO-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-layered surfaces, 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 approx. 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 UV pulses on to the Ni(111) and NiO(111) surfaces and that of the visible pulses on to the NiO(111) surface suggest that the photo-generated hot electrons induced 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.

AB - The effects of irradiation by picosecond ultraviolet (266 nm) and visible (532 nm) pulses of CO-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-layered surfaces, 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 approx. 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 UV pulses on to the Ni(111) and NiO(111) surfaces and that of the visible pulses on to the NiO(111) surface suggest that the photo-generated hot electrons induced 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.

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