University of Illinois Urbana-Champaign

The effect of applied uniaxial stresses on the optical absorption of F centers in alkali halides

Schnatterly, Stephen Eugene

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Description

Title
The effect of applied uniaxial stresses on the optical absorption of F centers in alkali halides
Author(s)
Schnatterly, Stephen Eugene
Issue Date
1965
Doctoral Committee Chair(s)
Compton, W.D.
Department of Study
Physics
Discipline
Physics
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
  • applied uniaxial stresses
  • optical absorption
  • f centers
  • alkali halides
  • F band
  • lattice distortions
  • tetragonal symmetry
  • trigonal symmetry
Language
en
Abstract
The method of moments is used to analyze the effect of applied uniaxial stresses on the optical absorption of alkali halides containing F centers. By measuring the first moment change of the F band due to uniaxial stresses applied in (100) and (1l0) directions,' the coupling of the F center excited state to lattice distortions of tetragonal and trigonal symmetry is evaluated. By measuring the third moment change due to the same ~pplied stresses, the separate contributions to the second moment of the F band of dynamic lattice distortions of tetragonal, trigonal, and breathing symmetries are evaluated. I Measurements of the zeroth moment change due to applied .stresses allow evaluation of the validity of the Condon approximation. Calculations based on three simple models of the K band are compared with the results of a measurement of the change in zeroth and-first moments of the K band produced by applied uniaxial stresses. The temperature dependence of the zeroth and first moments of the K band is calculated for the same three models. The results indicate that the K band is .. not .. due to transitions to a state of even parity. Brief measurements of the stress-induced dichroism in the Vl' R, and M band regions are reported.
Type of Resource
text
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http://hdl.handle.net/2142/23981
Copyright and License Information
1965 Stephen Eugene Schnatterly

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