Synchrotron radiation has been used to measure the reflectance spectra of KCl, KBr, RbCl, CsCl, CsBr, CaF₂, SrF₂, and BaF₂ for photon energies 6<ω<36 eV at temperatures $90<T<400$ K. Excitations of both valence and core electrons show sharp structure and strong T dependence. Analysis of the data in terms of excitonic and interband transitions from core states is made with regard to T dependence, crystal structure, and chemical composition.
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Rubloff et al. (1971) studied this question.
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