Abstract
The collision rate in colliding-beams experiments increases with the particle density in the interaction region. High-density electron beams have been used in measurements of electron-impact ionization of ions for which ratios of signal to noise of more than 100:1 have been obtained. However, space-charge potentials in the high-intensity electron beam may affect the ion beam and the electron energy distribution. We have investigated these influences and demonstrated that space charge compensation of the electron beam by slow positive ions is a feasible method for accurate cross section measurements.
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