TheKabsorption spectra of chlorine in SnCl2and SnCl2thinsp;sdot;thinsp;2H2O have been measured with a 50 cm bent quartzhyphen;crystal vacuum spectrograph. The spectra are quite similar to each other and have two intense absorption maxima near theKedge. The first maximum is ascribed to the transition to the lowest conduction band which results from the overlap of the 5pstates of the Sn2+ion and the 4pstates of the Clminus;ion, and the second maximum is attributed to the transition to the higherhyphen;lyingphyphen;like conduction band arising mainly from the 6pstates of the Sn2+ion. Furthermore, the spectrum of SnCl2is compared with the chlorineKabsorption spectrum of PbCl2which is isomorphous with SnCl2, and a significant difference between them has been found for the absorption structures just above theKedge. This difference is explained in terms of the difference between the lowest conductionhyphen;band structures of SnCl2and PbCl2.
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