1. Photoionization and dissociative photoionization of the allyl radical, C3H5
- Author
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Hans-Jürgen Deyerl, Mohamed Elhanine, Christian Alcaraz, Thomas Schüßler, Ingo Fischer, Institut of Physical Chemistry, University of Würzburg, Chemnitz University of Technology / Technische Universität Chemnitz, Laboratoire Francis PERRIN (LFP - URA 2453), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Chimie Physique D'Orsay (LCPO), Université Paris-Sud - Paris 11 (UP11)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Laboratoire pour l'utilisation du rayonnement électromagnétique (LURE), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-MENRT-Centre National de la Recherche Scientifique (CNRS)
- Subjects
EFFICIENCY ,PHOTOELECTRON-SPECTROSCOPY ,Radical ,Photoelectron photoion coincidence spectroscopy ,Photoionization ,010402 general chemistry ,Mass spectrometry ,Photochemistry ,01 natural sciences ,ISOMERS ,CROSS-SECTIONS ,SYNCHROTRON-RADIATION ,chemistry.chemical_compound ,X-ray photoelectron spectroscopy ,CHEMISTRY ,0103 physical sciences ,Physical and Theoretical Chemistry ,Instrumentation ,Spectroscopy ,010304 chemical physics ,IDENTIFICATION ,Allyl iodide ,PHOTOCHEMISTRY ,MASS-SPECTROMETRY ,IONIZATION ENERGIES ,Condensed Matter Physics ,0104 chemical sciences ,[CHIM.THEO]Chemical Sciences/Theoretical and/or physical chemistry ,chemistry ,Mass spectrum ,Ionization energy - Abstract
International audience; The photoionization and dissociative photoionization of the allyl radical in the VUV range was investigated using synchrotron radiation. Allyl radicals were generated by flash pyrolysis from allyl iodide and 1,5-hexadiene. Mass spectra show the appearance Of C3H3+ as a fragment in the dissociative photoionization of allyl above 10 eV. Between 10.4 and 10.5 eV the C3H3+ signal reaches 50% of its maximum value. Cyclopropenyl cation, c-C3H3+, is the thermochemically most stable product, but accompanying ab initio computations indicate that formation of linear 1-C3H3+ becomes competitive at small excess energies. The dissociative photoionization of the precursor molecules is discussed as well. An ionization energy of 8.13 +/- 0.01 eV was deduced from threshold photoelectron spectra.
- Published
- 2007
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