Abstract [C8H16]+. molecular ions from alkenes and cycloalkanes differing in their skeletal con‐figuration do not in general isomerise completely to a common structure, except for the molecular ion of n‐propylcyclopentane, the structure of which is identical to that of the normal octene ions. In contrast, decomposing [CnH2n−1]+ fragments are completely or almost completely isomerised after a lifetime of a few μs.
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K. Levsen (1975) studied this question.