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The optical constants of TlCl-TlBr mixed crystals are determined in the region of 2.8 to 6.0 eV from the measurements of normal incidence reflectivity as well as refractive index at helium temperature. As the composition changes, the lowest direct exciton peak shifts continuously with downward bending, while both the second and the third absorption peaks do not continue from TlCl to TlBr. The fourth peak is found to shift smoothly, but with upward bending. These phenomena are explained in relation to the band structures and the theory of electronic states of mixed system developed by Onodera and Toyozawa.
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Takahei et al. (1977) studied this question.
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