Abstract
A modified single stage mass spectrometer for studying charge transfer reactions is described. The energies of the ionizing electrons and of the primary ions can be controlled independently. The electron energy (range: 10–70 eV) has a spread of less than 1 eV and that of the primary ions (range: 20–150 eV) less than 2 eV. The apparatus can measure simultaneously the primary and secondary ion currents. The cross sections obtained are in agreement with those obtained with single and tandem mass spectrometers. The apparatus was used for determinations of cross sections and break-down spectra as functions of the energies of the primary ions or of the ionizing electrons.
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