Abstract

The K absorption spectra of chlorine in SnCl2 and SnCl2 ⋅ 2H2O have been measured with a 50 cm bent quartz-crystal vacuum spectrograph. The spectra are quite similar to each other and have two intense absorption maxima near the K edge. The first maximum is ascribed to the transition to the lowest conduction band which results from the overlap of the 5p states of the Sn2+ ion and the 4p states of the Cl− ion, and the second maximum is attributed to the transition to the higher-lying p-like conduction band arising mainly from the 6p states of the Sn2+ ion. Furthermore, the spectrum of SnCl2 is compared with the chlorine K absorption spectrum of PbCl2 which is isomorphous with SnCl2, and a significant difference between them has been found for the absorption structures just above the K edge. This difference is explained in terms of the difference between the lowest conduction-band structures of SnCl2 and PbCl2.

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