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Lanthanide
Actinide
Superactinide
Ion of Neptunium, Z=93, I.P.=159000 cm-1
References:
Saber J. et al. // Chin. Phys. B - 2014 - Vol. 23 - P. 023101.
Saber J. et al. // Chin. Phys. B - 2014 - Vol. 23 - P. 023101.