Abstract
High resolution SKβ emission spectra of S 2O 5 2− and HSO 4 − ions were measured with a two crystal X-ray spectrometer with an instrumental FWHM resolution of 0.25 eV for SKβ X-rays. The observed spectra are interpreted with the aid of semiempirical molecular orbital calculations based on the Extended Hückel and CNDO approximations. The relative energies can in both cases be attributed to the observed features in the corresponding experimental spectrum, but the relative intensities come out differently from the two approximations used. The influence of the two sulfur atoms in two different oxidation states is discussed in the case of S 2O 5 2−. The spectra of HSO 4 − and SO 4 2− are compared on the basis of the isoelectronic structure of these two ions.
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