Abstract
For positron impact on xenon the authors have measured the ratios of double-to-single and triple-to-single ionization cross sections, R2 and R3, respectively, and compared them with the corresponding cross section ratios for electron impact. At high projectile energies, at about 600-800 eV, the cross-section ratios R2(e+) and R2(e-) merge. At lower projectile energies, the positron ratios lie below the electron ratios. Qualitatively, this agrees with the results of Charlton et al. (1988, 89) for He, Ne and Ar.
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