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The dissociative recombination of hydrocarbon ions. III. Methyl-substituted benzene ring compounds

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 appar...

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Bibliographic Details
Published in:The Journal of chemical physics 2000-08, Vol.113 (8), p.3039-3045
Main Authors: Rebrion-Rowe, C., Mostefaoui, T., Laubé, S., Mitchell, J. B. A.
Format: Article
Language:English
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Summary: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.
ISSN:0021-9606
1089-7690
DOI:10.1063/1.1286974