Vibration-Assisted Absorption (B Band) in Alkali Halide-Thallium Crystals

  • Tsuboi Taiju
    Department of Physics, Faculty of Science, Kyoto University
  • Kato Riso
    Department of Physics, Faculty of Science, Kyoto University

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Absorption spectra of the B bands in alkali halide-thallium crystals have been investigated over the temperature range from 10°K to 300°K in KI–Tl, KBr–Tl and KCl–Tl. The integrated absorption intensities of the bands can be fitted well by coth (hνq⁄2 kT) law which is derived from the theory of the vibration-assisted absorption. Correlation between absorption intensities of the B and C bands with the variation of temperature was found, and it is concluded that the absorption intensity of the B band is supplied from the C band.

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