Abstract

Electronic structure properties of undoped single crystals of KPb2Cl5 (KPC) and RbPb2Cl5 (RPC) have been studied using low-temperature (T=8°K) far ultraviolet (3.7–24 eV) synchrotron radiation spectroscopy. Dispersions of optical functions have been calculated. The electronic transitions at 4.4–5.0 eV were ascribed to the excitation of cationic excitons. The energy region of 5–9 eV was associated with the transitions from the valence band to the conduction band: 6S106P11 at 6.28 eV, 6S106P32 at 5.94 eV. The complex band at 7.87 eV was attributed to the excitation of anionic excitons. The 19–24 eV peaks were associated with the 5d6p transitions in Pb2+ ions.

© 2014 Optical Society of America

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