We studied the X-ray-induced fragmentation of isothiocyanic acid, HNCS, following core ionization and excitation at the N1s, C1s, and S2p edges by Auger electron-ion coincidence spectroscopy. Mostly similar fragmentation products were identified at the different edges for normal and resonant Auger-Meitner decay, respectively. Upon normal Auger-Meitner decay, the dication was found to dissociate predominantly by C-S bond cleavage into HNC+ + S+ and CN+ + S+ ion pairs. The higher yield of undissociated HNCS2+ after S2p ionization is explained by a propensity for the population of low-binding energy final states at this edge. Following resonant core excitation into the 13a' or 4a″ orbital, S+ was found to be the main fragment, followed by HNC+. Fragments that require isomerization were observed with low yields after both core ionization and excitation. A comparison to isocyanic acid, HNCO, revealed significant differences in the fragmentation pattern of the two molecules.
Schaffner et al. (Thu,) studied this question.
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