Abstract
The discovery that neutral excited- and ground-state atoms are efficiently desorbed from alkali halide surfaces by both electrons and photons has raised a host of questions about the ways in which energy is absorbed, localized and redistributed in electronically-stimulated desorption. We present recent measurements of electron- and photon-stimulated desorption of neutral alkali atoms from LiF and NaCI which attempt to answer these questions by providing details of energy dependence, velocity distributions and variations in the desorption yield as a function of surface temperature. The ground-state neutral desorption dynamics under both electron and photon irradiation are consistent with a model in which halogens are ejected from the surface in a focused collision sequence, while the neutral alkalis are desorbed thermally. However, the excited-state neutrals do not follow this pattern, and further measurements to understand excited-state neutral desorption will be necessary. The implications of the experimental data for an understanding of the desorption mechanism-such as correlations with specific core-level excitations and with mobilities of electronically-induced defects-will be discussed.
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