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The transmission and reflectance of cuprous oxide has been measured from 6 to 250 {μ} and analyzed by classical dispersion theory. The two infrared-active vibrational frequencies are given by ν₁=613 cm^-1 and ν₂=146.0 cm^-1 with corresponding longitudinal-mode frequencies of 638 and 149 cm^-1. The maximum values of the extinction coefficient are calculated to be 2.7 and 4.0, respectively, for the two modes; both are higher than the literature values. The high-frequency and static dielectric constants are found to be ε_∞=6.6 and ε₀=7.6, respectively.
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E. C. Heltemes (1966) studied this question.
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