Abstract
Abstract Backscattering of MeV 4He+ ions has been used to show that the interplanar spacing between the topmost and second layers of a clean Pt(111) crystal is identical to that in the bulk (to ± 0.4%); i.e. the surface is unrelaxed. Adsorption of hydrogen at 185 K to a coverage of 1.10 × 1015 H-atoms cm−2 (measured by the D(3He,p)4He nuclear reaction) produces an outward relaxation of 0.003 ± 0.001 nm and also appears to reduce the vibrational amplitudes of the platinum surface atoms.
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