Abstract
Vibrationally induced desorption for a monolayer of 13C 16O physisorbed on the (100) surfaces of NaCl single crystals has been explored. In contrast to all previous work, a low power cw CO laser was employed to excite continuously the adsorbate for six hours. High-quality vibrational absorption spectra allowed us to monitor the photodesorption using an FTIR spectrometer. However, the desorption process was found to be slow and inefficient. The quantum yield is lower than 10 −7 and the desorption lifetime is longer than 10 2 s. This observation is in qualitative agreement with the prediction of simple vibrational relaxation propensity rules. It is concluded that the vibrationally induced desorption of NaCl (100)···CO (ν= 1) is inefficient because a large total change in quantum numbers must accompany this relaxation channel.
Published Version
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