Dissociative Photoionization of FC(O)SCH2CH3 following the shallow and inner–shell core electronic properties

RODRIGUEZ PIRANI, LUCAS SEBASTIÁN; GERONÉS, MARIANA; ERBEN, MAURICIO FEDERICO; ROMANO, ROSANA MARIEL; DELLA VÉDOVA, CARLOS OMAR; CAVASSO FILHO, REINALDO

Campinas, Brasil

Workshop; XX Reuniao Anual de Usuários (RAU); 2010

Laboratorio Nacional de Luz Sincrotrón, Brasil

We present here for the first time the study concerning to the photon impact excitation and dissociation dynamics of FC(O)SCH2CH3 excited at the S 2p level. Total Ion Yield (TIY) spectra and multicoincidence techniques, namely as PhotoElectron–PhotoIon Coincidence (PEPICO) and PhotoElectron–PhotoIon–PhotoIon Coincidence (PEPIPICO) time of flight (TOF) mass spectrometry were applied.Below the S 2p threshold, located at approximately 171.5 eV, the TIY spectrum is dominated by an intense resonance centered at 165.7 eV and two shoulders around 164.0 and 166.7 eV. Similar resonance features were observed for other member of the carbonylsulfenyl family of compounds already measured FCOSCH3. PEPICO and PEPIPICO spectra were measured at several photon energies around the S 2p edge. Possible mechanisms involved in the fragmentation of FC(O)SCH2CH32+ ion was deduced from the shape of the PEPIPICO double coincidence peaks. Total ion yield spectrum together with the PEPICO spectra at selected photon energies using synchrotron radiation in the valence region have been measured, thereby allowing the study of the dissociation dynamics of excited FC(O)SCH2CH3 molecules. The simultaneous evaluation of the results from both Photoelectron Spectroscopy (PES) and synchrotron photoionization measurements, complemented with high level ab initio calculations, provides unusually detailed insights into the valence ionization processes of these molecules.