He-atom scattering and mass-spectrometer flux analysis have been used to study structural changes accompanying photon-stimulated desorption (PSD) by valence electron excitation of NaCl(001) cleavage faces in situ. Within the considered temperature range from 550 to 240 K an incomplete photon-induced layer-by-layer removal is observed. In contrast to previous experiments and models not only neutral Cl and Na atoms but also NaCl molecules have been observed to desorb upon excitation. The rate of PSD is found to be strongly dependent on the temperature but independent of the surface topography.
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Hoche et al. (1993) studied this question.
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