1. Photoionization of 2-pyridone and 2-hydroxypyridine
- Author
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Frédéric Lecomte, Gilles Grégoire, Majdi Hochlaf, Jean-Pierre Schermann, Nicolas Nieuwjaer, Gustavo A. Garcia, Jean-Christophe Poully, Dhananjay Nandi, Lionel Poisson, Laurent Nahon, Charles Desfrançois, Laboratoire de Physique des Lasers (LPL), Université Paris 13 (UP13)-Centre National de la Recherche Scientifique (CNRS), Synchrotron SOLEIL (SSOLEIL), Centre National de la Recherche Scientifique (CNRS), 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 Modélisation et Simulation Multi Echelle (MSME), Université Paris-Est Marne-la-Vallée (UPEM)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS), Université Sorbonne Paris Cité (USPC)-Institut Galilée-Université Paris 13 (UP13)-Centre National de la Recherche Scientifique (CNRS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS), and Centre National de la Recherche Scientifique (CNRS)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Université Paris-Est Marne-la-Vallée (UPEM)
- Subjects
Photochemistry ,Pyridones ,Population ,Photoionization mode ,General Physics and Astronomy ,Photoelectron photoion coincidence spectroscopy ,Photoionization ,010402 general chemistry ,7. Clean energy ,01 natural sciences ,Ion ,Autoionization ,Ionization ,0103 physical sciences ,Physics::Atomic and Molecular Clusters ,Physical and Theoretical Chemistry ,education ,Ions ,education.field_of_study ,010304 chemical physics ,Chemistry ,Spectrum Analysis ,0104 chemical sciences ,[CHIM.THEO]Chemical Sciences/Theoretical and/or physical chemistry ,Atomic physics ,Ground state - Abstract
We studied the photoionization of 2-pyridone and its tautomer, 2-hydroxypyridine by means of VUV synchrotron radiation coupled to a velocity map imaging electron/ion coincidence spectrometer. The photoionization efficiency (PIE) spectrum is composed of steps. The state energies of the [2-pyridone](+) cation in the X[combining tilde] ground and A excited electronic states, as well as of the [2-hydroxypyridine](+) cation in the electronic ground state, are determined. The slow photoelectron spectra (SPES) are dominated by the 0(0)(0) transitions to the corresponding electronic states together with several weaker bands corresponding to the population of the pure or combination vibrational bands of the cations. These vibrationally-resolved spectra compare very well with state-of-the-art calculations. Close to the ionization thresholds, the photoionization of these molecules is found to be mainly dominated by a direct process whereas the indirect route (autoionization) may contribute at higher energies.
- Published
- 2010
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