Fall-off behaviour and kinetic isotope-effects in reactions of cyclic hydrocarbons

Ming-Chang Lin*, K. J. Laidler

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

26 Scopus citations


The geometrical and structural isomerizations of cyclopropane and the decomposition of cyclobutane are considered from the standpoint of the RRKM theory. The fall-off curves depend critically on the high-pressure Arrhenius parameters; the use of the latest values leads to good agreement with experiment in most cases. Whether or not a biradical mechanism is assumed, there is little effect on the calculated fall-off curves. The treatments are applied to isotope effects as functions of pressure and temperature. The activation energy difference ED - EH varies with pressure in a complicated way, a conclusion that throws light on apparent discrepancies between the results of different workers.

Original languageEnglish
Pages (from-to)927-944
Number of pages18
JournalTransactions of the Faraday Society
StatePublished - 1 Dec 1968


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