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

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

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. The compounds of the type XC(O)SY, related to important biological macromolecules, especially to coenzyme A, have been the subject of many theoretical and experimental investigations. By using synchrotron radiation in the range of 100-1000 eV, total ion yield (TIY) spectra, as well as multicoincidencespectra (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.