The reactions of some interstellar ions with benzene,cyclopropane and cyclohexane |
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| Institution: | 1. Institut für Ionenphysik, Universität Innsbruck, Technikerstraβe 25, A-6020 Innsbruck, Austria;2. Department of Chemistry, Brandeis University, Waltham, MA 02254, USA;1. College of Instrumentation & Electrical Engineering, Jilin University, Changchun 130023, China;2. Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China;3. University of Chinese Academy of Sciences, Beijing 100039, China;1. NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA;2. Department of Astronomy, University of Maryland, College Park, MD 20742, USA;3. Institut de Physique de Rennes, Equipe Astrochimie Experimentale, CNRS, Universite de Rennes 1, Campus de Beaulieu, 35042 Rennes Cedex, France;4. Dipartimento di Chimica “Giacomo Ciamician” Universitá di Bologna, via Selmi 2, I-40126 Bologna, Italy;1. Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian 116023, People''s Republic of China;2. Graduate University of Chinese Academy of Sciences, 19 Yuquan Road, Beijing 100039, People''s Republic of China;3. Instrument Science and Electrical Engineering College of Jilin University, 938 West Democracy Street, Changchun 130026, People''s Republic of China;1. Laboratory for Astrophysics, Leiden Observatory, Leiden University, PO Box 9513, NL-2300, RA Leiden, the Netherlands;2. Laboratory for Atmospheric and Space Physics, University of Colorado, Boulder, CO, USA;3. Department of Chemistry, University of Colorado, Boulder, CO, USA;4. Institute for Modeling Plasma, Atmospheres, and Cosmic Dust (IMPACT), NASA/SSERVI, Boulder, CO, USA;5. Leiden Observatory, Leiden University, PO Box 9513, NL-2300RA Leiden, The Netherlands;1. LPC2E, UMR CNRS 7328, Université d’Orléans, Cedex 2, France;2. LATMOS/IPSL, UVSQ Université Paris Saclay, UPMC Univ. Paris 06, Guyancourt, France;3. Laboratoire de Chimie Physique, CNRS, Univ. Paris Sud, Université Paris-Saclay, 91405, Orsay, France;4. Kochi Institute for Core Sample Research, Japan Agency for Marine-Earth Science and Technology, Kochi, Japan;5. Univ. Grenoble Alpes, CNRS, CNES, IPAG, 38000, Grenoble, France;6. LISA, UMR CNRS 7583, Université Paris Est Créteil et Université Paris Diderot, Institut Pierre Simon Laplace, France;7. CSNSM, CNRS/IN2P3, Univ. Paris Sud, Université Paris Saclay, Orsay, France;8. Institut Universitaire de France (IUF), Paris, France;9. Thermo Fisher Scientific (Bremen) GmbH, Germany |
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| Abstract: | The reactions of the cyclic molecules C6H6 (benzene), c-C3H6 (cyclopropane) and c-C6H12 (cyclohexane) with ArH+ (ArD+), H3+, N2H+, CH5+, HCO+, OCSH+, C2H3+, CS2H+ and H3O+ have been studied at 300 K using a SIFT apparatus. All the reactions except those of C2H3+ proceed via proton transfer and all are fast except the H3O+ and CS2H+ reactions with c-C6H12 which are endothermic and which establish that the proton affinity of c-C6H12 is 160 ± 1 kcal mol−1, which is considerably lower than the published value. In the c-C3H6 and the c-C6H12 reactions multiple products are observed and hence “breakdown curves” for the protonated molecules are constructed and the appearance energies of the various ion products are consistent with available thermochemical data. The reactions of C2H3+ with these cyclic molecules are atypical within this series of reactions in that they appear to proceed largely via hydride ion transfer. The implications of the results of this study to interstellar chemistry are alluded to. |
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