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Impurity-Induced Lattice Absorption

  • L. Genzel
Chapter
Part of the Optical Physics and Engineering book series (OPEG)

Abstract

In recent years much work has been done in studying the behavior of impurity particles in crystals with respect to their influence on lattice dynamics and optical absorption. Both are changed considerably by introducing defects in crystals mainly because they destroy the translational symmetry. Hence the normal modes of vibration are modified from their usual plane wave form. Although in a perfect crystal the conservation law for all wave vectors involved in any process of phonons and photons governs its relatively simple behavior, this wave vector conservation breaks down in crystals with impurities just due to the lack of periodic symmetry. With respect to electromagnetic absorption, this means that nearly all lattice modes might become optically active as long as these modes have a nonvanishing dipole moment over the periodicity interval. This dipole moment can have its origin simply in a charge of the impurity different from that of the perfect lattice on the same lattice site, but it can also be due to the changed eigen-vector especially near the defect, The latter case applies, of course, only in ionic crystals. If the defect concentration is small enough to avoid interactions between defects, then the absorption is proportional to their concentration.

Keywords

Local Mode Resonant Mode Band Mode Mode Absorption Isotopic Substitution 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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Copyright information

© Springer Science+Business Media New York 1969

Authors and Affiliations

  • L. Genzel
    • 1
  1. 1.Physikalisches InstitutFreiburgGermany

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