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We report measurements of the neutral and charged particle fractions produced by running beams of Li−, C−, O−, and Si− at energies up to 7 MeV through gas cells of N2, Ar, or CO2. We discuss the implications of these measurements for the design of neutralizers to produce high‐energy light atom beams for heating or current drive in tokamaks.

The impact-parameter dependence of the quasimolecular $K$ x rays emitted in collisions of 10-MeV ${\mathrm{Cl}}^{16+}$ with Ar has been measured. The coincidence spectra show a clear impact-parameter-dependent structure. The results are in good agreement with dynamical calculations which take into account the interference between the $1s\ensuremath{\sigma}$ decay amplitudes in the incoming and the outgoing halves of the trajectory.

The present status of the production of low-energy highly ionized beams by the 4-stage tandem accel-decel method is surveyed, and their use in three atomic physics experiments is summarized. The experiments are: the measurement of the charge state dependence of K-X-ray production in S+q-Ar collisions at 10 MeV, the impact-parameter dependence of quasimolecular X-rays in S+15-Ar collisions again at 10 MeV, and the determination of charge transfer cross section in S+q + Ar, He collisions. The results of the three experiments give evidence that the 4-stage accel-decel ion production technique is extremely powerful and useful.