Emission cross sections for spectral lines transiting from the In2+ lower laser 4d105p2P1/2,3/2 states excited by electron impact on the In+ ion

Energy dependences of ionization-with-excitation cross sections of the λ174.9 nm and λ162.6 nm lines related to the 4d105p2P1/2,3/2→4d105s2S1/2 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 4d95s2nl4d95s2nl autoionizing states of the In+ ion as well as 4d10nl,4d95s24d10nl,4d95s2 discrete states and 4d95p2,4d95s5d4d95p2,4d95s5d, and 4d9npn′l4d9npn′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 × 10−17 cm2 and 1.4 × 10−17 cm2, respectively, at the 100 eV energy. The effective population of the In2+ ion lower 4d105p2P1/2,3/2 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.