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Lanthanide
Actinide
Superactinide
Ion of Europium, Z=63, I.P.=344000 cm-1
References:
Dodson C., Zia R. // Phys. Rev. B - 2012 - Vol. 86 - P. 125102.
Dzuba V. et al. // Phys. Rev. A - 2003 - Vol. 68 - P. 032503.
Ôîê Ì.Â. // ÎèÑ - 1957 - Ò. 2 - Ñ. 127-135.