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An instrument for the study of charge transfer processes and ion-molecule reactions with negative ions has been constructed. It consists of an electron bombardment source, a primary ion mass analyser, an energy analyser and an accelerating lens followed by the reaction chamber and a secondary mass analyser. Mass analysed primary ion beams of experimentally useful intensities are produced over an energy range (in the laboratory system) from 0.2 eV to 100 eV with an energy spread of about 0.2 eV (full width at half maximum) above 2 eV.
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Vogt et al. (1976) studied this question.
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