Dissociative Photoionization of sulfenylcarbonyl -C(O)S- compounds induced by synchrotron radiation

MARIANA GERONÉS, MAURICIO F. ERBEN, EMILIANO CORTÉS, LUCAS RODRÍGUEZ PIRANI, MAOFA GE, ROSANA M. ROMANO, LI YAO AND CARLOS O. DELLA VÉDOVA

REVISTA MEXICANA DE FíSICA

Año: 2008

0035-001X

Recently, we have started with the study of the shallow and core-shell electronic excitation and fragmentation dynamics of carbonylsulfenyl (XC(O)SY) compounds. By using synchrotron radiation in the range of 100-1000 eV, total ion yield (TIY) and partial ion yield (PIY) spectra, as well as multicoincidence spectra (photoelectron-photoion coincidence, PEPICO, and photoelectron-photoion-photoion coincidence, PEPIPICO) were measured around the S 2p, Cl 2p, C 1s, O 1s, and F 1s transitions of the following carbonylsulfenyl (XC(O)SY) compounds: FC(O)SCl, ClC(O)SCl, CH3C(O)SH and CH3OC(O)SCl. Fragmentation patterns deduced from PEPICO spectra at various excitation energies in the VUV and soft X-ray regions were especially analyzed in order to establish the existence of a site-specific fragmentation effect. Also, ionic double coincidences were examined, and dissociation mechanisms were proposed to explain the shape and slope of observed PEPIPICO islands.