Mass-Spectrometric Study on Ion-Molecule Reactions of CH5+, C2H5+, and C3H5+ with C8—C18 n-Paraffins in an Ion Trap

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Chemical ionization of n-paraffins (CxH2x+2: x = 8—18) by the CH5+, C2H5+, and C3H5+ ions has been studied under a reactant-ion selective mode of an ion-trap type of GC/MS. In all the reactions, (MW-1)+ = CxH2x+1+ and fragment alkyl CyH2y+1+ (y = 3—x - 3) ions were observed. The dependence of the relative intensities of CxH2x+1+ and CyH2y+1+ on the reaction time indicated that collisional stabilization takes part in the formation of product ions. The dependence of CxH2x+1+ and CyH2y+1+ distributions on the reactant hydrocarbon ions and reagent chain length was examined. The reaction mechanism was discussed from the observed product-ion distributions and heats of reactions of each pathway.