Ion Source for Low-Energy Collision Studies

Abstract
An ion source is described which produces either positive or negative ion beams by electron bombardment of a jet of gas at relatively high pressure. The electrons are confined to an ionization region by a reflection‐collimation geometry. The ion currents produced are moderate (∼10−9 A) but the ion beams are very stable and noise‐free, and have a small spread in kinetic energy as required for low energy collision studies. Most of the data presented pertains to negative ions, although some positive ion results are given.

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