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Abstract:
Energy resolved helium atom scattering results for the multiple excitation of the perpendicular vibrations (S modes) of a krypton monolayer adsorbed on Pt(111) are presented for a wide range of incident angles. These measurements, which were obtained for incident helium atom energies much greater than the fundamental S-mode energy, are modeled within a general multiphonon scattering theory using a simple scattering form factor for a repulsive potential. The good agreement between experiment and theory indicates that the details of the He- surface interaction potential are relatively unimportant for incident energies much higher than the vibrational energy.
