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Proceedings 2017, 1(5), 81; doi:10.3390/ecas2017-04126

Molecular Fragmentation of Acetylene by VUV Double Photoionization

Laboratoire de physique des lasers (LPL), Institut Galilée-Université Paris 13 (UP13)—CNRS LPL UMR7538-99, Av. J.B. Clément, 93430 Villetaneuse, France
Department of Civil and Environmental Engineering, University of Perugia, Via G. Duranti 93, 06125 Perugia, Italy
Department of Chemistry, Biology and Biotechnologies, University of Perugia, Via Elce di Sotto, 8, 06123 Perugia, Italy
IOM-CNR Tasc, Km 163.5, Area Science Park, 34149 Trieste, Basovizza, Italy
Department of Basic and Applied Sciences for Engineering (SBAI), “Sapienza” University of Rome, Via A.Scarpa 14, 00161 Rome, Italy
Elettra-Sincrotrone Trieste, Area Science Park, 34149 Trieste, Basovizza, Italy
Department of Chemistry and Drug Technology, University of Rome “La Sapienza”, 00185 Rome, Italy
Presented at the 2nd International Electronic Conference on Atmospheric Sciences, 16–31 July 2017; Available online:
Author to whom correspondence should be addressed.
Published: 17 July 2017
(This article belongs to the Proceedings of the 2nd International Electronic Conference on Atmospheric Sciences)
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Acetylene is a simple molecule of interest for interstellar medium (ISM) and planetary atmospheres. The presence of C2H2 was detected by IR spectroscopic measurements. Acetylene was also found as a minor component in the atmosphere of gas giants like the planet Jupiter, in the atmosphere of Saturn’s satellite Titan, and in comets, where photochemical experiments have demonstrated that this simple hydrocarbon is a likely precursor of C2, a widely observed component in such environments. It has to be noted that the presence in planetary atmospheres and ISM of Vacuum Ultra Violet (VUV) light’s photons as well as cosmic rays makes highly probable the double photoionization of molecular species with the production of molecular dications producing subsequent dissociation into ionic fragments having a high kinetic energy content of several eV. This translational energy is sufficient in some cases to allow ions escape from the upper atmosphere of some planet of the Solar System, as Venus, Mars and Titan, into space. In this contribution we present the experimental study of the microscopic dynamics of the two-body dissociation reactions of the C2H2+2 dication, induced by the double ionization of acetylene molecules by VUV photons in the energy range of 31.9–50.0 eV. The photoionizing agent was a tunable synchrotron radiation beam, while ion products are revealed by coupling photoelectron-photoion-photoion-coincidence and ion imaging techniques. The measured angular distributions and kinetic energy of product ions exhibit significant changes (as the photon energy increases) for the three leading dissociation reactions producing H++C2H+, C++CH2+, and CH++CH+, providing detailed information on the fragmentation dynamics of the C2H22+ dication.
Keywords: double photoionization; acetylene; synchrotron radiation; molecular dication; planetary atmosphere; ions escape double photoionization; acetylene; synchrotron radiation; molecular dication; planetary atmosphere; ions escape
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Falcinelli, S.; Lorent, V.; Pirani, F.; Alagia, M.; Schio, L.; Richter, R.; Stranges, S.; Vecchiocattivi, F. Molecular Fragmentation of Acetylene by VUV Double Photoionization. Proceedings 2017, 1, 81.

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