Desorption of helium atoms from thin films

Creators: Sinvani, M.; Goodstein, D. L.; Cole, M. W.; Taborek, P.

Abstract

Investigation is made of the desorption of He atoms from thin films. Three different experimental geometries are used to study the dependence on substrate material, film temperature, and duration of the heat pulse. The major conclusions are that (a) the speed distribution is similar to a Maxwellian, (b) the angular distribution is strongly focused about the normal direction, (c) desorption time constants differ systematically from estimates, and (d) a phonoatomic effect analogous to the photoelectric effect is observed. The measurements are analyzed in terms of several theoretical models. Conclusions are drawn about the time evolution of the film thickness and temperature.

Additional Information

©1984 The American Physical Society Received 1 September 1983; revised 27 April 1984 This research was supported in part by the U.S. Office of Naval Research under Contract No. N00014-80-C-0447 and by the National Science Foundation under Grant No. DMR-81-13262. Part of it was completed while one of us (M.W.C.) was a guest at the Institute for Theoretical Physics at the University of California (Santa Barbara). The hospitality of that Institution is gratefully acknowledged.

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