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Lanthanide
Actinide
Superactinide
Ion of Americium, Z=95, I.P.=297000 cm-1
References:
Brewer L. // JOSA - 1971 - Vol. 61 - P. 1666-1688.
Gaigalas G. et al. // Phys. Rev. A - 2009 - Vol. 79 - P. 022511.