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An ion beam apparatus for the absolute measurement of collision cross sections in singly and multiply charged ions is described. An inclined electron and ion beams arrangement is used. Emitted photons from the decay of collision produced excited states are collected by a mirror and imaged onto a photomultiplier. Absolute measurements of the electron impact excitation of the 2s–2p transition in C3+ were used to demonstrate the reliability of the apparatus.
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Lafyatis et al. (1987) studied this question.
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