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Please use this identifier to cite or link to this item: http://hdl.handle.net/10119/4498

Title: Optical second harmonic spectroscopy of rutile TiO_2(110) in air
Authors: Kobayashi, E.
Wakasugi, T.
Mizutani, G.
Ushioda, S.
Keywords: Second harmonic generation
Titanium oxide
Sum frequency generation
Surface electronic phenomena
Issue Date: 1998-05-15
Publisher: Elsevier
Magazine name: Surface Science
Volume: 402-404
Start page: 537
End page: 541
DOI: 10.1016/S0039-6028(97)00969-2
Abstract: We have measured the reflected optical second harmonic (SH) intensity from rutile TiO_2(110) as a function of the fundamental photon energy. A sharp rise in the SH intensity was observed >2ħω=3.4eV. The sum frequency intensity also shows a rise at ħω_1+ħω_2~3.4 eV. Thus the observed sharp rise of the SH intensity is due to a resonance with an electronic excitation at 3.4 eV. This energy is different from the two-photon resonance energy 2ħω=3.02eV of the bulk band gap of TiO_2. Hence the origin of this resonance is attributed to surface electronic states. We have also found that the SH intensity pattern as a function of the azimuthal angle changes drastically when the fundamental photon energy is scanned across this onset energy. We suggested that this is due to the variation of the shape of the wavefunction of the excited electronic states at this energy.
Rights: NOTICE: This is the author's version of a work accepted for publication by Elsevier. E. Kobayashi, T. Wakasugi, G. Mizutani, and S. Ushioda, Surface Science , 402-404, 1998, 537-541, http://dx.doi.org/10.1016/S0039-6028(97)00969-2
URI: http://hdl.handle.net/10119/4498
Material Type: author
Appears in Collections:c10-1. 雑誌掲載論文 (Journal Articles)

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