Abstract
Results of energy level calculations using a B-spline basis set are reported. The truncated-diagonalization method has been extended to include a correction for the presence of the open channels. It is also shown how to determine autoionization widths within this basis. The approach is demonstrated by calculating these properties for singlet terms belonging to the 3l3l' and 3l4l' configurations in the doubly-excited N5+ ion. It is shown that for the calculation of energy level values the B-spline method can compete with the most accurate methods available. The accuracy in the determination of the autoionization widths appears to be limited by the independent-channel approximation.
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