Abstract
Desorption induced by self-trapping (ST) of a surface excitation is studied for a model in which the localization of the surface excitation eliminates the surface bond of the desorbing particles. The adiabatic energy of the system is calculated with the use of discrete and continuum models. The free (F) state is meta- or unstable against the desorptive state for any small force to expel the adsorbate at the site of the localization. The absence of the elastic deformation energy due to bond scission causes decrease of the adiabatic energy with increase in the degree of localization, which induces a large bond dilation leading to desorption. The barrier height separating F and ST-induced desorptive states is evaluated from the adiabatic energy. The desorption probability is discussed in conjunction with its temperature and coverage dependence, where the possibility of tunneling from the metastable F state to the desorptive one is predicted.
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