Studies of the surface deuterioxyl group and adsorbed D 2 O on γ-Al 2 O 3 using picosecond infrared pump probe spectroscopy

Ken Onda, Kinuka Tanabe, Hidenori Noguchi, Akihide Wada, Takafumi Shido, Aritomo Yamaguchi, Yasuhiro Iwasawa

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Picosecond infrared-infrared pump-probe experiments in the OD stretching region were carried out on dehydrated and multilayer water-adsorbed γ-Al 2 O 3 . For the dehydrated γ-Al 2 O 3 , transient bands assigned to the bleaching and hot bands of the OD stretching mode of isolated surface hydroxyl groups were observed, and the population lifetime (T 1 of the vibrational excited state (v = 1) of the mode was 200 ± 10 ps at 293 K. The characteristic temperature dependence of T 1 is indicative of a seven-phonon process. For the water-adsorbed γ-Al 2 O 3 , the transient bleaching and transient hot bands with a lifetime of 10-12 ps were observed by excitation of the absorption peak at 2630 cm -1 . In addition to these bands, weak transient bands were observed in the low-frequency region. These results are considered evidence of the existence of isolated water molecules on the γ-Al 2 O 3 surface. Pure dephasing is also discussed based on the bandwidth of the observed transient bands.

Original languageEnglish
Pages (from-to)11456-11461
Number of pages6
JournalJournal of Physical Chemistry B
Volume105
Issue number46
DOIs
Publication statusPublished - Nov 22 2001
Externally publishedYes

Fingerprint

Spectrum Analysis
Pumps
Spectroscopy
pumps
Infrared radiation
Water
probes
Phonons
spectroscopy
Bleaching
Stretching
bleaching
Hydroxyl Radical
water
life (durability)
Temperature
Excited states
Multilayers
Population
excitation

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry

Cite this

Studies of the surface deuterioxyl group and adsorbed D 2 O on γ-Al 2 O 3 using picosecond infrared pump probe spectroscopy . / Onda, Ken; Tanabe, Kinuka; Noguchi, Hidenori; Wada, Akihide; Shido, Takafumi; Yamaguchi, Aritomo; Iwasawa, Yasuhiro.

In: Journal of Physical Chemistry B, Vol. 105, No. 46, 22.11.2001, p. 11456-11461.

Research output: Contribution to journalArticle

Onda, Ken ; Tanabe, Kinuka ; Noguchi, Hidenori ; Wada, Akihide ; Shido, Takafumi ; Yamaguchi, Aritomo ; Iwasawa, Yasuhiro. / Studies of the surface deuterioxyl group and adsorbed D 2 O on γ-Al 2 O 3 using picosecond infrared pump probe spectroscopy In: Journal of Physical Chemistry B. 2001 ; Vol. 105, No. 46. pp. 11456-11461.
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AU - Noguchi, Hidenori

AU - Wada, Akihide

AU - Shido, Takafumi

AU - Yamaguchi, Aritomo

AU - Iwasawa, Yasuhiro

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