CEQUINOR   05415
CENTRO DE QUIMICA INORGANICA "DR. PEDRO J. AYMONINO"
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Outer electronic distribution of sulfenylcarbonyl compounds in the valence region
Autor/es:
CARLOS OMAR DELLA VEDOVA; ERBEN, M.; GERONÉS, M.; ROMANO, R. M.; HOMEM, M.; CAVASSO FILHO, R.; NAVES DE BRITO, A.
Lugar:
Campinas
Reunión:
Congreso; XVI Reuniao Anual de Usuários (RAU); 2006
Resumen:
A collaborative work on the subject “Polarization dependence effect on the photo-fragmentation dynamic of sulfenylcarbonyl molecules” has been started at the LNLS in 2005. The project tends to the study of the polarization effect after core excitation of -SC(O)- containing molecules. To reach this goal, the deep core regions should be measured. However, for a clear interpretation of these results, the knowledge of the transition state –especially the arrangement of vacant orbitals- is essential. In the same direction, the extension of the fragmentation is closely related with the orbitals involved in the chemical bonds. Thus, the outer valence distribution is a key factor for understanding the fragmentation dynamic [1]. In relation with sulfenylcarbonyl compounds, La Plata’s group has reported an analysis of He(I) Photoelectron spectra for FC(O)SCl molecule [2]. Using the SGM and TGM lines available at the LNLS facilities, the energy range of study was further extended. Thus, FC(O)SCl [3] and ClC(O)SCl [4] molecules and others sulfenylcarbonyl compounds have been measured. Results obtained by using the TGM beamline in the energy range 12-21.2 eV for the simplest five-atomic members of the –SC(O)- family, FC(O)SCl and ClC(O)SCl, are presented. In order to avoid higher harmonic component in the incident beam, the innovative helium gas filter accessory was used [5]. Total and Partial Ion Yield and PEPICO spectra were acquired in order to investigate fragmentation process following a single ionization event. FC(O)SCl results in a good candidate in order to compare results obtained with synchrotron radiation and the He(I) Photoelectron spectra. Indeed the photoelectron spectra reveals properties such as symmetries of the valence electrons and the electron density of a particular orbital while the coincidence studies will give insight about the nature of the fragmentation channels followed when a valance electrons is removed from that orbital.
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