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Collisional quenching of iodobenzene ion one-photon photofragmentation
Affiliation:1. Department of Chemistry, University of Hawai‘i at Mānoa, Honolulu, HI 96822, USA;2. W.M. Keck Laboratory in Astrochemistry, University of Hawai‘i at Mānoa, Honolulu, HI 96822, USA;3. Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA;1. Chemistry & Chemical Engineering Department, Department of Environment and Safety Engineering, Department of Materials Engineering, Taiyuan Institute of Technology, Taiyuan 030008, PR China;2. College of Chemistry and Chemical Engineering, Shanxi University, Taiyuan 030006, PR China;1. Institute of High Current Electronics SB RAS, 2/3 Akademichesky Ave., Tomsk, 634055, Russian Federation;2. National Research Tomsk State University, 36 Lenin Ave., Tomsk, 634050, Russian Federation;1. State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, China;2. Institute of Environmental Engineering, School of Metallurgy and Environment, Central South University, Changsha 410083, China;3. College of Agricultural and Environmental Sciences, Department of Crop and Soil Sciences, University of Georgia, Griffin, GA 30223, United States
Abstract:The one-photon photodissociation of iodobenzene ion at 514.5 nm is quenched to a substantial extent by ion—neutral collisions at pressures in the 10−6−10−5 Torr range. This indicates that a major fraction of the ion population dissociates with rates less than or of the order of 102 s−1. The quenching results are in accord with quasi-equilibrium theory calculations. Reinterpretation of threshold photodissociation data in the light of this collisional quenching leads to a heat of formation of 1135 kJ mol−1 for phenyl cation.
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