The shift of vibrational frequency of surface OH groups on TiO2 particles induced by UV pulse irradiation has been studied by time-resolved IR absorption spectroscopy. By the UV irradiation of the TiO2 particles, the absorption intensity at 3696 cm-1 was decreased and that at 3654 cm-1 was increased. These changes were gradually recovered on a millisecond time scale. The transient changes were interpreted by a small (< 0.1 cm-1) shift of a v(O-H) band at 3677 cm-1. The temperature jump triggered by the UV pulse caused the shift.
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