Abstract
Smoluchowski's concept of the surface double layer of bare metals is extended for physical adsorption of rare gas atoms on metal surfaces. With the use of the polarization approach it is possible to show that the work function decrease on physical adsorption of rare gases is anisotropic. A simple rule is suggested according to which the work function change produced by physical adsorption of the given rare gas on different crystal faces of the same metal [-Δφ( hkl)] decreases with increasing work function of the bare face [φ 0( hkl)] and/or with increasing packing density of the bare face. The former correlation is quantitative, whereas the latter correlation is only qualitative. The above predictions are compared with the first data available in the literature.
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