Abstract
The selective adsorption of helium and molecular hydrogen has been experimentally observed on various copper surfaces characterized by a quasi one-dimensional corrugation: Cu(110), (113), (115), (117). Four bound state energy levels for the He-Cu potential and six for H 2-Cu have been measured. They are independent of the surface crystalline structure. They are well fitted by a 9-3 potential from which the well depth is deduced: D = 6.35 meV for He-Cu and D = 22 meV for H 2Cu. The Van der Waals constant C 3 is also estimated from the data. The ratio C 3, He C 3, H 2 is approximately the ratio of the static polarizabilities of He and H 2. The semi-empirical formula of Hoinkes is found to agree with the present data.
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