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Journal of Applied Spectroscopy

, Volume 74, Issue 1, pp 74–80 | Cite as

Effect of uniaxial strain on the structure of self-localized excitons in alkali halide crystals

  • K. Sh. Shunkeev
  • E. T. Sarmukhanov
  • A. A. Barmina
  • L. N. Myasnikova
  • S. K. Shunkeev
Article
  • 25 Downloads

Abstract

We have used luminescence spectroscopy to establish the effect of low-temperature (100 K) elastic uniaxial strain on the configuration of a self-localized exciton (SLE) in alkali halide crystals (AHCs) at the instant of radiative relaxation. In face-centered (fc) alkali halide crystals, redistribution of the luminescence intensity occurs from the asymmetric SLE configuration to the symmetric SLE configuration (type III → II → I), while conversely in body-centered (bc) alkali halide crystals the redistribution occurs in favor of the asymmetric (polarized) SLE configuration (type I → II). External strain along the 〈100〉 direction leads to effective slip of the anions in the alkali halide crystals along the 〈110〉 direction, coinciding with the direction of compression of the SLE, which promotes creation of preferentially the symmetric SLE configuration, while strain along the 〈110〉 direction, acting perpendicularly to the length of the SLE, leads to elongation of the SLE, which promotes creation of the asymmetric SLE configuration with a higher degree of polarization.

Key words

alkali halide crystal self-localized exciton low-temperature elastic uniaxial strain radiative relaxation of a self-localized exciton with symmetric and asymmetric configurations 

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Copyright information

© Springer Science+Business Media, Inc. 2007

Authors and Affiliations

  • K. Sh. Shunkeev
    • 1
  • E. T. Sarmukhanov
    • 1
  • A. A. Barmina
    • 1
  • L. N. Myasnikova
    • 1
  • S. K. Shunkeev
    • 2
  1. 1.Aktobe State Pedagogical InstituteAktobeKazakhstan
  2. 2.Al-Farabi Kazakh National UniversityAlmaty

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