CENTRO DE QUIMICA INORGANICA "DR. PEDRO J. AYMONINO"
Unidad Ejecutora - UE
Interstellar H3+ and HCS+ Ions Produced in the Dissociative Photoionization Process of CH3C(O)SCH3 in the Proximity of the Sulfur 2p, Carbon 1s, and Oxygen 1s Edges
MARIANA GERONÉS; MAURICIO F. ERBEN; ROSANA M. ROMANO; REINALDO L. CAVASSO FILHO; CARLOS O. DELLA VÉDOVA
JOURNAL OF PHYSICAL CHEMISTRY A
AMER CHEMICAL SOC
Lugar: Washington; Año: 2012 vol. 116 p. 2571 - 2571
In this work we present a study of the dissociative photoionization of S-methyl thioacetate [CH3C(O)SCH3] by using multicoincidence time-of-flight mass spectrometry and synchrotron radiation in the S 2p, C 1s, and O 1s edges. Total and partial ion yield spectra together with photoelectronphotoion coincidence (PEPICO) and photoelectronphotoionphotoion coincidence (PEPIPICO) spectra were measured. Fragmentation patterns deduced from PEPICO and PEPIPICO spectra at the various excitation energies show a moderate site-specific fragmentation. The dissociation dynamic for the main ion-pair production is discussed. Two-, three-, and four-body dissociation channels have been observed in the PEPIPICO spectra, and the dissociation mechanisms are proposed. The interstellar HCS+ and H3+ ions can be observed during the synchrotron experiments reported in the present work.