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Lanthanide
Actinide
Superactinide
Ion of Samarium, Z=62, I.P.=334000 cm-1
References:
Dzuba V. et al. Phys. Rev. A - 2003 - Vol. 68 - P. 032503.
Dodson C., Zia R. // Phys. Rev. B - 2012 - Vol. 86 - P. 12510.