The secondary spectra arising from ionic reactions in propane at several mean ion energies are reported. The results are compared with computed values taken from results obtained by the elegant techniques developed by Lindholm. From the comparison a calculation is made for the secondary spectrum obtained by bombarding C3H8with C2H4+ions. Experiments using mixtures of C2D4and C3H8lead to an observed secondaryhyphen;ion spectrum which is in good agreement with that calculated. A significant number of ionic fragments in the secondary spectrum appear to be formed by endothermic processes. It is assumed that translational energy supplies the required energy. Some appearancehyphen;potential measurements support this assumption. There appears to be some evidence for CH3mdash;transfer when C3H8is bombarded either by C2H5+or C2H4+. In both cases there is also a competing Hmdash;transfer process.
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