State-selective electron capture in C3+-H, H2collisions (0.7-4.6 keV amu-1) studied by photon spectroscopy

Abstract
By means of photo emission spectroscopy, absolute cross sections for total and state-selective electron capture for impact of 0.7-4.6 keV amu-1 C3+ 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 analyser. For C3+-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.