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Specular reflectance and reflectance-magnetodichroism measurements on single-crystal and polycrystalline CdCr2Se4 and CdCr2S4 have been made at liquid-helium temperatures. The specular reflectance is generally characterized by a single strong peak near the band edge. The magneto-reflectance is quite rich in structure extending from the band edge to about 5.0 eV.
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Ahrenkiel et al. (1971) studied this question.
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