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Translational energy spectroscopy (TES) in a furnace target arrangement (previously developed in this laboratory) has been used to identify the main collision channels in the process of one-electron capture by C3+ and N3+ ions in H and H, within the energy range 1.5-18 keV. A higher energy resolution than in our previous measurements and a greatly increased produ;t-ion detection efficiency has been achieved by the use of a position-sensitive detector. Additional features are observed in the energy-change spectra for C3+ in H and the results allow a more detailed comparison with the theoretical predictions of Bienstock et al and recent experimental measurements of Ciric et al based on the complementary technique of photon emission spectroscopy (PES). A detailed analysis of the results for N3+ impact is complicated by the presence of collision channels involving both ground-state and metastable primary ions. Nevertheless, important collision channels not predicted by theory are observed in both H and H2.

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