Abstract
In recombinative desorption of hydrogen from clean Pd100 vibrationally excited molecules are observed. The population in the excited states is higher than corresponding to molecules in thermal equilibrium with the surface. This population also increases nearly exponentially with the surface temperature, T S. If the population is converted to desorption rates, an activation energy for vibrational excitation can be derived. These activation energies of 234 meV, 282 meV, and 428 meV for D 2, HD, and H 2, respectively, are in all three cases lower than the corresponding gas phase energies.
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