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An interpretation of two recent experiments involving the inelastic scattering of helium atoms from thin films composed of long organic chain molecules is given based on multiphonon-scattering theory. In the semiclassical limit of the experiments, the theory depends only upon the temperature of the film and the effective mass of the molecular end hit by the incoming helium beam. The effective mass of the end group is obtained and suggested experimental directions are given.
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Manson et al. (1993) studied this question.
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