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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 configuration interaction method. Based on this calculation, the resonant transfer and excitation cross sections of Ca19+ with H2 and He targets are estimated in impulse approximation. The theoretical results for Ca19+ + H2 system are compared with the measurements available. The effect of target electron momentum distribution on the resonant transfer and excitation cross sections is discussed.