State-selective electron capture in C(3+)-H, H2 collisions (0.7-4.6 keV per amu) studied by photon spectroscopy

By means of photon emission spectroscopy, absolute cross sections for total and state-selective electron capture for impact of 0.7-4.6 keV per amu C(3+) on atomic and molecular hydrogen have been measured. At three impact energies total cross sections have also been directly measured with a retarding field-charge state analyzer. For C(3+)-H(1s), the present data are in agreement with the measurements of McCullough et al. (1983) obtained by means of translational energy spectroscopy, whereas, apart from the total cross sections, no agreement is found with the quantal calculations of Bienstock et al. (1982). The present measurements illustrate the capability of photon emission spectroscopy for unambiguous identification of the final states involved in state-selective electron capture by multi-charged ions from atomic hydrogen.