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The C 5 H 10 adduct ions from the two highly exothermic reactions of propene (C 3 H 6 ) radical cations with neutral ethene (C 2 H 4 ) and cyclopropane radical cation with ethene were isolated and detected by incorporating an r.f.-only-mode event into the FTMS experimental sequence. These adducts, which cannot be observed under the low-pressure...