Abstract
Abstract Photo-stimulated desorption (PSD) of sodium atoms from sodium halide crystals has been investigated using intense synchrotron radiation from a planar-type undulator. The PSD intensities of ground-state and excited-state Na atoms showed different temperature dependence, indicating different desorption processes. The temperature dependence of the PSD intensities was also different from that of thermally stimulated desorption. Moreover, time response of the excited-state Na desorption was found to consist of a nanosecond component and a slower one. The temperature dependence of the nanosecond component was also different from that of the slow PSD. These present results are consistent with the idea that the excited-state alkali desorption can be interpreted with two models, a fast desorption induced by electronic transition in the surface layer and a slow one due to thermal process of surface defects.
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