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首页> 美国政府科技报告 >Measurement of Surface Phonon Dispersion Relations for LiF, NaF, and KCl Through Energy-Analysed Inelastic Scattering of a Helium Atomic Beam.
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Measurement of Surface Phonon Dispersion Relations for LiF, NaF, and KCl Through Energy-Analysed Inelastic Scattering of a Helium Atomic Beam.

机译：用氦原子束的能量分析非弹性散射测量LiF，NaF和KCl的表面声子色散关系。

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A crystal surface terminates abruptly one dimension of lattice periodicity, constituting a lattice defect with concomitant localized modes of vibration, termed surface phonons. Such surface phonons have previously been investigated in the long wavelength, non-dispersive regime. The present work reports the first observation of surface phonons in the short wavelength, dispersive range. The data allow for the first time a surface phonon dispersion curve to be plotted completely from origin to edge of the surface Brillouin zone. Measurements were made of phonons along the (anti GAMMA anti M) and (anti GAMMA anti X) azimuths of the LiF(001) surface and along the azimuth of NaF(001) and KC1(001) surfaces. The results are in substantial agreement with theoretical predictions, although for LiF the measured Rayleigh dispersion curve at M lies appreciably below the theoretical value, possibly reflecting the effects of surface relaxation. (Atomindex citation 13:681377)

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