A comprehensive experimental study of the dynamical interaction of He atoms with Cu(001) surface phonons
作者： F. Hofmann , J. P. Toennies , J. R. Manson
DOI: 10.1063/1.468005
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摘要: We present new measurements of inelastic He atom scattering from the surface phonons Cu(OO1) as a function crystal temperature, incident energy, and parallel momentum transfer. A careful subtraction multiphonon intensity other background contributions time-of-flight intensities reveals three distinct surface-localized vibrational modes which are ascribed to Rayleigh phonon, longitudinal bulk resonance, further acoustic resonance at higher energy transfers. The couples very strongly atoms and, for wide range conditions, gives peaks more intense than those due mode. dependence these peak analyzed with aid simple distorted wave Born approximation, different coupling parameters two determined compared available data. incoherent diffuse elastic is shown decrease transfer according theory Fraunhofer random array point defects. be in agreement quick approximation. 0 I994 American Institute Physics.
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