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Lanthanide
Actinide
Superactinide
Ion of Protactinium, Z=91, I.P.=357000 cm-1
References:
Urer G., Ozdemir L. // Chin. J. Phys. - 2012 - Vol. 50 - P. 581-588.
Safronova U. et al. // Phys. Rev. A - 2007 - Vol. 76 - P. 042504.