A selected ion flow tube investigation of the positive ion chemistry of a number of bromine containing fully and partially halogenated hydrocarbons

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In this paper we report the reactions of OH- with the halogenated methanes CCl4, CCl3F, CCl2F2, CCIF3, CF4, CHCl3, CHCl2F, CHClF2, CHF3. CH2Cl2, CH2CIF. CH2F2, CH3Cl, and CH3F in a 0.5 Torr helium buffer gas at 300 K using a selected ion flow tube. Reaction rate coefficients were measured and branching ratios determined for the large number of reactions studied. The results are discussed in terms of the thermochemistry of the reactions and barriers that exist to different reaction pathways. It is demonstrated that there is no barrier to proton and Cl+ abstraction. while significant barriers exist for nucleophilic substitution. (C) 2004 Elsevier B.V. All rights reserved.


Original languageEnglish
Pages (from-to)91-106
Number of pages16
JournalInternational Journal of Mass Spectrometry
Publication statusPublished - 1 Jan 2003


  • ion-molecule reactions, nucleophilic substitution, halogenated methanes