Charge-Transfer Cross Sections for N2+ Ions Incident on H2 and D2 between 20 and 1000 eV

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Abstract
Absolute cross sections for slow-ion production have been measured for beams of N2+ incident on H2 and D2 targets. The beam energy was varied from 20 to 1000 eV. A sharp maximum in the cross section was observed for the case of D2 at a beam energy of about 100 eV. A more gentle maximum, lying close to 200 eV, was found for the H2 target gas. These results are very similar to those found for argon ions on H2 and D2. The observed cross sections were found to vary only slightly with ionizing electron energy, which was varied between 16 and 25 eV. As an instrumental check, the intensity of the resulting neutral N2 beam was examined and found to be consistent with that formed by symmetric charge transfer.