The optical spectra of PbI 2 and PbF 2 between their fundamental absorption edges and 130 eV are presented. A Kramers-Kronig analysis is made, and the data are discussed and compared with band structure calculations. A comparison with photoemission spectra provides a measurement of core exciton binding energies. In PbF 2 it is as high as 9 eV, which is more than twice the size of those found in alkali halides.
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Beaumont et al. (1977) studied this question.
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