State-selective electron capture in slow C3+-H collisions

Abstract
State-selective capture in C3+-H collisions is investigated in the energy range 1-5000 eV amu-1 using the molecular model, modified to include appropriate translation factors. The effect of translation in the dominant reaction channel (capture to the (2s3s)3S state of C2+) is of considerable importance for energies exceeding 50 V amu-1. Calculated cross sections for this channel are in satisfactory agreement with experiment. An analysis of the experimental data concerning the singlet and the weak triplet channels is also presented. Some of the contradictions between the photon emission spectroscopy and the translational-energy spectroscopy data can be reconciled by the present calculations.