The angular distributions of multiquantum excitations of the lowest energy, frustrated translational vibrations of a low coverage of CO chemisorbed on Cu(001) have been investigated by high resolution helium scattering time-of-flight measurements. The elastic and the one-phonon creation and annihilation cross sections show several interference undulations as a function of parallel momentum transfer, and up to four multiquantum overtones. All the experimental observations are in reasonable agreement with a multiquantum scattering theory, which also provides information on the height and width of the adsorbed CO molecules.
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Bertino et al. (1994) studied this question.
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