A selected ion flow tube study of the reactions of small CmHn+ ions with Oatoms

The reactions of thirteen CmHn+ ions (m less than or equal to 6) with atomi c and molecular oxygen and nitric oxide have been measured using a selected ion flow tube operating at room temperature. Rate coefficients and product distributions are reported for each reaction. Most of the hydrocarbon ions studied exhibit relatively rapid reactions with O atoms and proceed at sub stantial fractions of the collision rate. All O atom reactions showed multi ple product channels and the formation of a -C-O bond, either in the ion pr oduct or the neutral product of reaction. (C) 2000 American Institute of Ph ysics. [S0021-9606(00)00811-4].