The dissociative recombination of hydrocarbon ions. III. Methyl-substituted benzene ring compounds
| Autor: | C. Rebrion-Rowe, T Mostefaoui, J. B. A. Mitchell, Sylvain Laubé |
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| Přispěvatelé: | Physique des atomes, lasers, molécules et surfaces (PALMS), Centre National de la Recherche Scientifique (CNRS)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES), Université de Rennes (UR)-Centre National de la Recherche Scientifique (CNRS) |
| Rok vydání: | 2000 |
| Předmět: |
010304 chemical physics
[SPI.PLASMA]Engineering Sciences [physics]/Plasmas General Physics and Astronomy Cycloheptatriene Aromaticity 010402 general chemistry Photochemistry Dissociative recombinaison 01 natural sciences 0104 chemical sciences Ion chemistry.chemical_compound chemistry 0103 physical sciences [CHIM]Chemical Sciences Molecule Physical and Theoretical Chemistry Benzene Mesitylene Isomerization Dissociative recombination |
| Zdroj: | Journal of Chemical Physics Journal of Chemical Physics, American Institute of Physics, 2000, 113 (8), ⟨10.1063/1.1286974⟩ Journal of Chemical Physics, 2000, 113 (8), ⟨10.1063/1.1286974⟩ |
| ISSN: | 1089-7690 0021-9606 |
| DOI: | 10.1063/1.1286974 |
| Popis: | International audience; The recombination of electrons with cyclic ions produced via ion – molecule reactions between atomic precursor ions and methyl-substituted benzene ring compounds ͑(toluene , ortho-, and para-xylene and mesitylene) has been studied at 300 K using a flowing afterglow Langmuir probe-mass spectrometer apparatus. Differing amounts of energy can be deposited into the daughter ions depending upon which atomic precursor is used. It has been found that same-mass daughter ions formed from different precursors displayed different recombination rate coefficients indicating that different isomeric forms were reacting. In particular , the benzene ring of the toluene cation expands to a seven-membered ring following isomerization to the cycloheptatriene form. H atom abstraction allows two different isomeric daughter ions to be formed that do not interconvert and that display different recombination rates. A similar behavior was observed for the xylenes and for mesitylene. All recombination rates lie in the range from 10-7 to 10 -6 cm3 s-1 and display no apparent relation with size nor with the aromaticity of the ions . |
| Databáze: | OpenAIRE |
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