Fig. 7
Level ordering with the original level index (ID) relative to the ordering of Fe21+ by mapping according to the “good” quantum numbers – configuration, total angular momentum J, and energy ordering for ions spanning the entire sequence. The spikes and dips are due to the shift of a given level, for example, 2p23s 4P (62–65) levels in Fe21+ move to levels above 120 in N2+.
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