Ionic fragmentation of selenium oxychloride under VUV irradiation

MARIANA GERONÉS; LUCAS RODRÍGUEZ PIRANI; MAURICIO F. ERBEN; REINALDO L. CAVASSO FILHO; ROSANA M. ROMANO; CARLOS O. DELLA VÉDOVA

Campinas

Otro; 20ª Reunião Anual de Usuários (RAU), Laboratório Nacional de Luz Síncrotron; 2010

Our research group has quite recently started studying the properties of shallow- and inner-core level electrons in sulfur-containing compounds. Thus, sulfenylcarbonyl species, including FC(O)SCl,[1,2] ClC(O)SCl,[3] CH3C(O)SH,[4] and CH3OC(O)SCl[5]  and thiocyanates species, such as CH3SCN[6] and  CCl3SCl[7] have been studied by using synchrotron radiation and multicoincidence techniques. The recent development of a neon gas filter in the TGM line at the Brazilian Synchrotron National Laboratory (LNLS) which affords “pure” synchrotron radiation in the 12-21.5 eV range, has allowed us to expand the study on the electronic properties and photoionization dynamics into the valence region. Thus, sulfenylcarbonyl compounds like FC(O)SCl [8], ClC(O)SCl [8] and CH3C(O)SCH3 [9] have been recently analyzed in this energy range. Following these studies, we became interested in selenium-containing compounds. Thus, the selenium oxychloride was the first molecule chosen to be studied. In the present work, we report preliminary results concerning to the to the photodissociation of this molecule in the 12-300 eV range. This energy range allows us to record the Se 3d, Se 3p, Se 3s and Cl 2p edges togheter with the valence region. Speciall interest should be paied in the selenium 3d and 3p region, as comparing with the S 2p edge. Total Ion Yield (TIY) and PhotoElectron–PhotoIon Coincidence (PEPICO) spectra have been measured under VUV irradiation. The isotopic distribution of the selenium and chlorine is clearly observed in the TOF spectra due to the suitable mass resolution attained in the experiments.