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The physical interaction potential of gas atoms with single-crystal surfaces, determined from gas-surface diffraction experiments

H. Hoinkes

H. Hoinkes

  • Physikalisches Institut der Universität Erlangen-Nürnberg, Erwin-Rommel-Str. 1, D 8520 Erlangen, Germany

Rev. Mod. Phys. 52, 933 – Published 1 October, 1980

DOI: https://doi.org/10.1103/RevModPhys.52.933

Abstract

A comprehensive survey and data collection of experimental results achieved from diffracting beams of light gases like H, D, He3, He4, and H2 from single-crystal surfaces (alkali halides, oxides, and graphite) is given, and it is shown that gas-surface diffraction is a valuable tool to get detailed information on the physical gas-surface potential: (a) From comparison of diffracted beam intensities with calculations in a corrugated hardwall approximation the periodic structure of the interaction potential is obtained together with information on the atomic structure at the surface. (b) From bound-state resonance investigations one gets information on the different terms of the gas-surface potential in Fourier expansion v(r) =ΣG vG(z)exp(iG·R): the achieved spectrum of binding energies {Ej} can be used to construct the main term v00(z), whereas observed splitting of degenerate bound states allows evaluation of the strength of the periodic terms vG(z). (c) from Ej levels near the dissociation limit the constant C3 of gas-surface long-range dispersion attraction can be determined. Finally, regarding the experimental results on C3 and the potential well depth D, two semiempirical rules are established: C3=KC·α(ε1)(ε+1) and D=KD·α(ε1)(ε+1). These rules allow the calculation of C3 and D from the static electric polarizability α of the atom, the optical dielectric constant ε of the solid, and the system-independent constants KC, KD given in the text. Calculated values of D for several gas-surface systems are given in a table.

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