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The collisional activation (CA) spectra of gaseous ions formed by the protonation of cyclopropane and propene are identical, indicating that the isomerization c -C~H~+sec-C3H7+ occurs in < s. However, ion-molecule reactions of C3H7+ at -IO-* Torr indicate that c-C3H7+ ions can have lifetimes of s, supporting the results of equilibrium constant measurements by Chong and F r a n k h 5 They derived AHf(c-C3H7+) -AHf(sec-C3H?+) = 8 kcal/mol, consistent with the prediction of M I N D 0 / 3 calc~lations;~ however, the apparent low activation energy for c-C3H7+sec-C,H?+ indicated by the CA results is not consistent with the MIND0/3 value3 of AHf(n-C3H7+) -A H~( c -C~H~+ )

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