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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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Published in: | The Journal of chemical physics 2000-08, Vol.113 (8), p.3039-3045 |
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Main Authors: | , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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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. |
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ISSN: | 0021-9606 1089-7690 |
DOI: | 10.1063/1.1286974 |