The first observation of resonant structures is reported in the double ionization cross section in Ba + as a function of electron-impact energy, which are attributable to the 4d-ionization and the 5s-ionization followed by the autoionization. A brief description of the experimental method and procedures is presented. A discussion is also presented to provide a solid foundation to the identificaticn of the indirect processes concerned. Experimental results are compared with tentative results of the calculation using the distorted-wave Born exchange approximation by Younger.
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Hirayama et al. (1987) studied this question.
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