High sensitivity spectroscopy of molecules adsorbed on oxide surfaces using enhancement effect of defect states

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Aiming at developing high sensitivity spectroscopy of molecules adsorbed on oxide surfaces, vibrational sum frequency generation(VSFG) spectra on various oxide surfaces were measured. We discovered extraordinary strong signal located at 1600cm-1, which is three orders of magnitude stronger than ordinal signals, on a TiO2single crystal surface in air. In order to reveal the origin of this strong signal, we measured VSFG spectra of various molecules on various modified surfaces. The results implied that the enhancement effect is attributed to the resonance effect to the mixing state between surface water and defect states of the oxide surface.