Abstract
Wave functions and energies for band states of helium atoms in the two-dimensional periodic potential at the surface of a semiinfinite rare gas solid have been studied. In the case of Kr and Ar substrates, the atoms are highly localized and, correspondingly, the band widths are small. In a third case, namely that of an argon crystal highly compressed to simulate the adsorption site density of the close-packed face of argon, much larger band widths were found. If this is a reasonable simulation, then band effects may be observable.
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Novaco, A.D., Milford, F.J. Quantum states of he atoms adsorbed on surfaces of rare gas solids. J Low Temp Phys 3, 307–326 (1970). https://doi.org/10.1007/BF00628155
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DOI: https://doi.org/10.1007/BF00628155