Infrared-visible sum frequency generation spectroscopy applied to adsorption and reaction at solid surfaces

Chiaki Hirose; Nobuyuki Watanabe; Junko N. Kondo; Akihide Wada; Kazunari Domen

doi:10.1117/12.221473

25 September 1995 Infrared-visible sum frequency generation spectroscopy applied to adsorption and reaction at solid surfaces

Chiaki Hirose, Nobuyuki Watanabe, Junko N. Kondo, Akihide Wada, Kazunari Domen

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Proceedings Volume 2547, Laser Techniques for Surface Science II; (1995) https://doi.org/10.1117/12.221473
Event: SPIE's 1995 International Symposium on Optical Science, Engineering, and Instrumentation, 1995, San Diego, CA, United States

Abstract

Infrared-vision sum frequency generation (IR-vis SFG) spectroscopy and temperature programmed desorption (TPD) spectroscopy were used to investigate the systems prepared by the adsorption of formic acid onto MgO(001) and Pt(110) surfaces. Prominent vibrational bands observed on the SFG spectra were located at 2870 cm^-1 on the MgO surface and a 2960 cm^-1 on the platinum surface, which were assigned to the CH stretching band of formate ion (HCOO^-) produced by the dissociative adsorption. On the MgO surface, three different sites, produced by the repetition of adsorption-thermal desorption cycles, were identified as responsible for the adsorption. The tilt angle of the CH group was estimated from the polarization characteristics of SFG signals and was derived as 0 degree(s) +/- 30 degree(s) for the group giving dominant SFG peak. On the Pt(110) surface, at least six vibrational bands were identified on the SFG spectra, and the temperature dependence indicated that the orientation of formate molecules changed right before their desorption. Expressions of SFG tensor components of a diatomic molecule were derived.

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Chiaki Hirose, Nobuyuki Watanabe, Junko N. Kondo, Akihide Wada, and Kazunari Domen "Infrared-visible sum frequency generation spectroscopy applied to adsorption and reaction at solid surfaces", Proc. SPIE 2547, Laser Techniques for Surface Science II, (25 September 1995); https://doi.org/10.1117/12.221473

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