title: Photoionization of Benzophenone in the Gas Phase: Theory and Experiment.
abstract: We report on the single photoionization of jet-cooled benzophenone using a tunable source of VUV synchrotron radiation coupled with a photoion/photoelectron coincidence acquisition device. The assignment and the interpretation of the spectra are based on a characterization by ab initio and density functional theory calculations of the geometry and of the electronic states of the cation. The absence of structures in the slow photoelectron spectrum is explained by a congestion of the spectrum due to the dense vibrational progressions of the very low frequency torsional mode in the cation either in pure form or in combination bands. Also a high density of electronic states has been found in the cation. Presently, we estimate the experimental adiabatic and vertical ionization energy of benzophenone at 8.80 ± 0.01 and 8.878 ± 0.005 eV, respectively. The ionization energy as well as the energies of the excited states are compared to the calculated ones.
authors: †Laboratoire Matériaux, Molécules et Applications, Institut Préparatoire aux Etudes Scientifiques et Techniques, La Marsa, Université de Carthage, Carthage, Tunisie.
authors: Noura
authors: N
authors: Khemiri
authors: †Laboratoire Matériaux, Molécules et Applications, Institut Préparatoire aux Etudes Scientifiques et Techniques, La Marsa, Université de Carthage, Carthage, Tunisie.
authors: Sabri
authors: S
authors: Messaoudi
authors: †Laboratoire Matériaux, Molécules et Applications, Institut Préparatoire aux Etudes Scientifiques et Techniques, La Marsa, Université de Carthage, Carthage, Tunisie.
authors: Manef
authors: M
authors: Abderrabba
authors: ‡CEA, CNRS, IRAMIS/LIDyL/Laboratoire Francis Perrin URA2453, CEA Saclay, 91191 Gif-sur-Yvette, France.
authors: Gloria
authors: G
authors: Spighi
authors: ‡CEA, CNRS, IRAMIS/LIDyL/Laboratoire Francis Perrin URA2453, CEA Saclay, 91191 Gif-sur-Yvette, France.
authors: Marc-André
authors: MA
authors: Gaveau
authors: ‡CEA, CNRS, IRAMIS/LIDyL/Laboratoire Francis Perrin URA2453, CEA Saclay, 91191 Gif-sur-Yvette, France.
authors: Marc
authors: M
authors: Briant
authors: §CNRS, CEA, IRAMIS/LIDyL/Laboratoire Francis Perrin URA2453, CEA Saclay, 91191 Gif-sur-Yvette, France.
authors: Benoît
authors: B
authors: Soep
authors: §CNRS, CEA, IRAMIS/LIDyL/Laboratoire Francis Perrin URA2453, CEA Saclay, 91191 Gif-sur-Yvette, France.
authors: Jean-Michel
authors: JM
authors: Mestdagh
authors: ∥Université Paris-Est, Laboratoire Modélisation et Simulation Multi Echelle, MSME UMR 8208 CNRS, 5 bd Descartes, 77454 Marne-la-Vallée, France.
authors: Majdi
authors: M
authors: Hochlaf
authors: §CNRS, CEA, IRAMIS/LIDyL/Laboratoire Francis Perrin URA2453, CEA Saclay, 91191 Gif-sur-Yvette, France.
authors: Lionel
authors: L
authors: Poisson