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- W3020592286 abstract "Time-resolved measurements of vibrational relaxation rates have determined the population decay of vibrationally excited OH groups: adsorbed on high surface area SiO 2 ; in model silanols, and as defect sites in quartz. 1 Depopulation of the vibrationally excited OH oscillator was found to occur on a time scale of 80–300 ps. The temperature dependence of the vibrational relaxation rates in quartz (OH) and on SiO 2 (OH and OD) were all found to follow a simple multiphonon relaxation model. 2 However, the relative rates for the two isotopes (rate OD /rate OH = 1.6) on SiO 2 didnotscale as predicted by the theoretical models (rate OD /rate OH = 13). Recent measurements of isotopically substituted silanols (R 3 SiOH and R 3 SiOD dilute in CCl 4 ) also find OD decay times comparable with those of OH. The observed decay rates appear to be dominated by processes which proceed through a SiOH bending mode. Prospects for extending these methods to longer wavelengths with improved temporal resolution are discussed." @default.
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- W3020592286 date "1986-01-01" @default.
- W3020592286 modified "2023-09-25" @default.
- W3020592286 title "Vibrational relaxation of adsorbed molecules" @default.
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- W3020592286 doi "https://doi.org/10.1364/ils.1986.tup1" @default.
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