We measured the rotationally inelastic diffractive scattering probabilities for an HD beam colliding with a smooth Pt(111) surface. These largeTthinsp;rarr;thinsp;Rinelastic probabilities were measured as a function of incidence angle for a 110 meV beam energy. The results are in excellent agreement with a simple physical model of an eccentrically weighted sphere colliding with a hard wall, with an attractive well depth of 55plusmn;10 meV. The numerical lsquo;lsquo;GRrsquo;rsquo; method of Garcia and cohyphen;workers was found superior to an eikonal method in solving this rotational quantum boundary value problem.
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