Photodetachment technique for measuring H− velocities in a hydrogen plasma

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Abstract
This article reports work in progress on laser diagnostics of negative‐ion transport velocity in H−‐ion volume sources. The plasma dynamics after the laser shot is discussed in detail, and the effect of the potential perturbation on the H− velocities is evaluated. A method of evaluation of the H− transport velocity from single‐laser‐beam photodetachment experiments is proposed. To substantiate this method, two‐laser‐beam photodetachment experiments have been effected. The velocities thus determined are pressure dependent; they correspond to H− energies in the range 0.23–0.08 eV.