A variational calculation shows that inert-gas atoms can only be adsorbed above protruding surface atoms, but not on flat metal planes or at surface lattice sites. The calculation also yields the effective polarizability of a helium atom near a metal plane. The inert-gas atoms are adsorbed at the apex of metal surface atoms by a field-induced dipole—dipole interaction. A statistical consideration expresses the probability of field adsorption in terms of experimental parameters. Preliminary atom-probe data on the temperature and field dependence of image gas adsorption agree with the theoretical results.
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Tsong et al. (1971) studied this question.
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