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Lanthanide
Actinide
Superactinide
Ion of Promethium, Z=61, I.P.=331000 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.