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Thermoreflectance spectra of semiconducting CdO single crystals at 100^ with carrier concentrations in the range (2-40) X 10^18/cm^3 give 2. 28 eV for the direct ₁₅-₁ gap. Two indirect gaps are found: L₃-₁ at 1. 09 eV and ₃-₁ at 0. 84 eV. Theoretical calculations of the shape of the spectrum, taking explicitly into account the band-population effects, are in qualitative agreement with the experimental results. The spectra of sputtered films of CdO differ substantially from single-crystal spectra, suggesting structural differences between films and crystals.
F. P. Koffyberg (Sat,) studied this question.