Abstract
The reaction rate constants and product distributions for reaction of CH 3 + and C 2H 5 + with ethylene, C 2H 5 + with propene and cyclopropane, and C 3H 5 + and C 3H 7 + with the four butene isomers are reported here. The results were obtained using a Dempster-ion cyclotron resonance tandem mass spectrometer which mass analyzes and decelerates the reactant ions to less than 0.1 eV. The internal excitation energy of all but the methyl reactant ions may be varied through unreactive collisions in the first stage of the instrument. Deuterated reactant ions have been used in an attempt to classify reaction channels according to models such as hydride abstraction, proton transfer or complex formation. Most of the major reaction channels studied here are best described as proceeding through a short-lived intermediate complex. The reactions of C 2H 5 + with propene and cyclopropane are particularly interesting since the major product, C 4H 9 +, is produced through both direct proton transfer and complex formation.
Published Version
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