Lattice Vibrations and Optical Waves in Ionic Crystals

  title={Lattice Vibrations and Optical Waves in Ionic Crystals},
  author={Kun Huang},
LATTICE vibrations in ionic crystals are usually treated with the unretarded Coulomb forces. Despite some discussions in the existing literature1,2, the precise nature of the effect due to retardation remains unknown. We have found that explicit solution of the problem is possible for diatomic crystals with optical isotropy, mainly because the lattice vibrations concerned are very long waves, for which the lattice behaviours can be described by the following equations3: where w is the… 
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The interest in the frequency spectrum of the thermal vibrations in a crystal arose chiefly in connexion with the problem of the specific heat of crystals at low temperatures. Debye’s theory of the
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