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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The N = 1<--0 pure rotation transition in the nu = 19 level of the ground electronic state of H2(+) was observed at 14,961.7+/-1.1 MHz. Recent theory predicts significant electric dipole intensity in forbidden rotation and rotation-vibration transitions involving levels near the dissociation limit; the relevant levels are bound by only 0.74 and 0.22 cm(-1). The transition was predicted to have a transition moment of 0.42 D; our measurement is consistent with this value.

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Collinear laser-beam/ion-beam spectroscopy provides a collision-free environment in which to study atomic and molecular ions. Ion-beam spectroscopy has particular advantages over other methods: spectra are relatively simple due to mass selection; kinematics allow sub-Doppler resolution of the whole velocity distribution; and the Doppler effect can be used to tune ions into resonance with fixed frequency light sources. We consider methods by which spectra have been obtained and review important results of ion-beam spectroscopy in fields from nuclear physics to astrophysical chemistry.