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Optical absorption and photoelectron spectra of CsPbCl 3 and CsPbBr 3 have been studied. A sharp absorption peak is found at about 3 eV in CsPbCl 3 and 2.4 eV in CsPbBr 3 and its position shifts toward lower energy as the temperature decreases. XPS and UPS measurements of the materials suggest that this first peak is to be assigned mainly to the 6 s →6 p transition in Pb 2+ ions.
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Ito et al. (1978) studied this question.
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