Ionic yield and dissociation pathways from soft X-ray multi-ionization of acetic acid

We present data from inner shell excitation and multi-ionization of acetic acid with synchrotron radiation at at energies around C Is edge. The measurements were taken at the Brazilian Synchrotron Light Laboratory (LNLS) and at center for advanced microstructures & devices (CAMD), employing soft X-ray photons (200-310 eV) from a toroidal grating monochromator (TGM) beamline. The main dissociation route were the secondary decay after deferred charge separation (SDDCS) process and deferred charge separation (DCS) processes. The main dissociation channels were associated to the ions pairs H+ + C+, H+ + CH+, H+ + CH2+ H+ + O+, H+ + CO+ and H+ + COH+. About 70-80% of the dissociation channels leads to the production of energetic (3-7 eV) protons. The ejection of reactant radical COOH+ was seen in about 7-10% of the channels. (C) 2006 Elsevier B.V. All rights reserved.