Emission cross sections for spectral lines transiting from the In2+ lower laser 4d105p 2P1/2,3/2 states excited by electron impact on the In+ ion

Energy dependences of ionization-with-excitation cross sections of the lambda 174.9 nm and lambda 162.6 nm lines related to the 4d(10)5p P-2(1/2,3/2) -> 4d(10)5s S-2(1/2) transitions in the In2+ ion were studied using a spectroscopic method in crossed electron and In+ ion beams. A well-defined structure related to the excitation of the 4d(9)5s(2)nl autoionizing states of the In ion as well as 4d(10)nl, 4d(9)5s(2) discrete states and 4d(9)5p(2),4d(9)5s5d, and 4d(9) npn'l autoionizing states of the In2+ ion was observed in the excitation functions for both lines. The absolute cross section values for the lines under investigation were determined and found to be 0.7 x 10(-17) cm(2) and 1.4x10(-17) cm(2), respectively, at the 100 eV energy. The effective population of the In2+ ion lower 4d(10)5p P-2(1/2,3/2) laser levels under ionization-with-excitation is shown to result from the contribution of cascade processes as well as excitation-autoionization process related mainly to the correlation interaction between the outer s-shell and inner d-shell. (C) 2013 Elsevier B.V. All rights reserved.