Routine measurement of i.v. agents, analogous to that for volatile anaesthetic agents, may be possible.

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A selected ion flow tube apparatus was used to investigate the positive ion chemistry of two derivatives of SF 6 ; SF 5 CF 3 and SF 5 Cl. This represents the first investigation of the positive ion chemistry of SF 5 Cl, and much of the data on SF 5 CF 3 is being presented here for the first time. Rate coefficients and ion product branching ratios have been determined at room temperature (300 K) for reactions with the following twenty-two cations; with SF 5 Cl, all of which have rate coefficients significantly less than the capture mechanism value. Several distinct processes are observed among the large number of reactions studied, including dissociative charge transfer and various abstraction channels. Non-dissociative charge transfer is not observed, implying that any parent ions formed dissociate rapidly to the fragment ions and associated neutrals.

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