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The index of refraction of tellurium has been measured for single-crystal samples having 1017 impurity atoms/cm3. The values were found to vary from 4.95 at 4μ to 4.85 at 8μ for radiation polarized with E-vector perpendicular to the C-axis and from 6.31 at 4μ to 6.20 at 8μ for the E-vector parallel to the C-axis.
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Hartig et al. (1954) studied this question.
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