[3P16] Changes in electron-stimulated desorption yields from KBr surface via two types of defects
We have studied the electron-stimulated desorption from surface of alkali-halides by using grazing angle scattering of protons. When the surface of an alkali halide is irradiated by a few keV of electron energy, several types of defects are created inside the crystal. Numerous defects diffuse in the bulk and form a cluster of defects under the surface which stimulates surface atoms to desorb. Desorption that causes a change in the morphology of the surface is categorized into two types. The 1st is formation of a pit with monolayer depth on a flat surface and the 2nd is desorption from the step edges of the pit. In this study, the changes in desorption yields due to these defects are investigated by comparing the measured scattering intensities of fast protons with calculated ones obtained by a proton-scattering-simulation.