Ion–Molecule Reactions by a Photoionization Mass Spectrometer. III. C3H6+n-C4D10 and Cyclo-C3H6+n-C4D10 Mixtures

Abstract

Ion–molecule reactions of the parent ions of propylene and cyclopropane (C3H6+ and cyclo-C3H6+, respectively), with deuterated n-butane (n-C4D10) have been studied by a photoionization mass spectrometer. Ionizing radiation was Lyman alpha (1216 Å) which produced only one primary ionic species (C3H6+ or cyclo-C3H6+) in the mixture of C3H6 and n-C4D10 or of cyclo-C3H6 and n-C4D10. It has been found that, besides the two reactions, D− and D2− transfer, deuterium atom abstraction by C3H6+ (or D atom transfer) takes place in each system. Reaction cross sections for all of these reactions have been determined at a field strength of 4.0 V/cm. These values in angstroms2 unit are: D− transfer 13, D2− transfer 7.1, D transfer 4.8 (C3H6+n-C4D10 system), D− transfer 30, D2− transfer 2.0, D transfer 8.1 (cyclo-C3H6+n-C4D10 system).