Single-electron stripping cross sections ofN1+in Ne, Ar, and Kr between 35 and 140 keV

The single-electron stripping cross section for $\mathrm{N}_1^{}{}_{}{}^{+}$ ions in targets of Ne, Ar, and Kr have been measured in the energy range 35 to 140 keV. It was found that the observation of the linear relationship between the target pressure and the counting rate is an inadequate test for single-collision conditions in these reactions. The angular spread was found to be significant, and the lack of agreement among previous measurements seems to be explainable in terms of the different ways in which the angular spread was handled. The two-state and the Firsov theories of charge-changing cross sections are unable to account for the considerable differences in the cross sections between the three targets.