By using a thin NiO single-crystal sample, it has been possible to observe electroreflectance spectra between 3.0 and 5.0 eV. The results of this study and a recent photoconductivity investigation suggest that an energy-band description which includes the $3d$ electrons is necessary for a full description of NiO interband optical properties.
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Jerrold Lloyd McNatt (1969) studied this question.
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