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Picosecond and femtosecond infrared techniques are used to characterize vibrational energy transfer rates and provide novel insights into the relaxation of non-equilibrium energy distributions. For adsorbates on metal surfaces, it is essential to determine the absolute coupling strengths between different degrees of freedom, i.e., vibrational modes and low-lying electronic states. In the present...
Laser-induced desorption of CO from an ion beam etched and annealed Si(111) surface is reported. State-resolved measurements of the desorbed CO reveal very high translational and vibrational energy contents, with the rotational excitation being quite low. The results suggest that the CO photodesorption is derived from CO bound to ion beam etch-induced active @'defect@' site(s) on the Si(111)7 7...
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