Dielectronic recombination and resonant transfer excitation for Ca19+ ions

In the frame of quantum defect theory, the dielectronic recombination cross sections of Ca19+ ion are calculated by a simple relativistic configuratio n interaction method. Based on this calculation, the resonant transfer and excitation cross sections of Ca19+ with H-2 and He targets are estimated in impulse approximation. The theoretical results for Ca19+ + H-2 system are compared with the measurements available. The effect of target electron mom entum distribution on the resonant transfer and excitation cross sections i s discussed.