Temperature dependence of the CN radical reactions with C2H2 and C2H4 |
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| Affiliation: | 1. Dipartimento di Chimica “Giacomo Ciamician”, Università di Bologna, Via F. Selmi 2, 40126, Bologna, Italy;2. Center for Astrochemical Studies, Max Planck Institut für Extraterrestrische Physik Gießenbachstraße 1, 85748, Garching bei, München, Germany;3. Dipartimento di Chimica Industriale “Toso Montanari”, Università di Bologna, Viale del Risorgimento 4, 40136, Bologna, Italy;1. Institute of Physical Chemistry, Polish Academy of Sciences, Kasprazaka 44/52, Warsaw, 01-224, Poland;2. Department of Chemistry, Kindai University, Higashi, Osaka, 577-8502, Japan;3. Univ Rennes, Ecole Nationale Supérieure de Chimie de Rennes, CNRS, ISCR - UMR 6226, F-35000, Rennes, France;4. Université Paris-Saclay, CNRS, Institut des Sciences Moléculaires d’Orsay, 91405, Orsay, France;1. Universidade do Vale do Paraíba (UNIVAP), Laboratório de Astroquímica e Astrobiologia (LASA), Av. Shishima Hifumi, 2911, Urbanova, CEP: 12244000, São José dos Campos, SP, Brazil;2. Departamento de Fisica, Instituto Tecnológico de Aeronáutica, ITA - DCTA, Vila das Acacias, São José dos Campos, 12228-900, SP, Brazil;1. Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur 208016 (UP), India;2. DST Thematic Unit of Excellence on Soft Nanofabrication, Indian Institute of Technology Kanpur, Kanpur 208016, UP, India;1. Key Laboratory for Green Chemical Technology of MOE, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300350, PR China;2. Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin University, Tianjin 300350, PR China;3. Department of Applied Chemistry, Faculty of Engineering, Oita University, 700 Dannoharu, Oita 870-1192, Japan |
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| Abstract: | The temperature dependence of the reaction rates for CN radicals with C2H4 and C2H4 and C2H2 has been measured from room temperature to 700 K. The two laser photoionization/LIF-probe technique was used by photolyzing ICN at 266 nm and monitoring CN depletion via B ↔ X LIF at 388 nm. A resistively heated slow-flow gas reactor was employed at 50 Torr total pressure for the temperature dependence study. Both reactions were found to have rate constants that decreased with temperature, fitting kC2H4 = (4.72±0.25)×10−11exp[(509±20)/T] and kC2H2 = (3.49±10−11exp[(571±23)/T] cm3 molecule−1 s−1, indicating that both reactions occur by addition—elimination mechanism. No pressure dependence was observed within experimental errors. |
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