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The lower energy levels of the protactinium (Pa) atom are unusually difficult to treat theoretically. Pa is located where the 6d and 5f energies cross; simple calculations consistently put the electron configurations $$5f^16d^27s^2$$ and $$5f^26d^17s^2$$ in the incorrect order. We have used multireference spin–orbit configuration interaction to compute the energies of these states to determine...
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