Ovcharenko Y. Excitation of indium ion by slow electrons

Precise studies of the energy dependences of effective electron excitation cross sections for resonance lines and spectral transitions from the shifted 5p2 3Pj- terms to the 5s5p 3Po1- triplet level of the In+ ion have been carried out by a spectroscopic method using electron and ion beams crossed at right angle. Clear structural features have been revealed in the above energy dependences due to the direct (or via the cascade transitions) contribution of the resonance processes. The structure below the excitation thresholds for the spectral lines under study is due to the radiative transitions resulted from the process of dielectronic recombination. An effective channel of electron decay of autoionizing states due to the Coster-Kronig process is observed in the interval of excited levels splitting. The main channel of resonance line population beginning from the 12 eV energy is related to the radiative cascade transitions from shifted terms and ionic autoionizing states.A comparative analysis of ionicspectral lines of aluminum subgroup has shown that the structural features for the lighter elements are mainly due to the increasing role of correlation effects in the valence shell, while for the heavier ones this results from that both in the valence shell and between the valence and subvalence shells.