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Lanthanide
Actinide
Superactinide
Ion of Molybdenum, Z=42, I.P.=1157900 cm-1
References:
Singh A. et al. // Phys. Scr. - 2013 - Vol. 88 - P. 035301.
Sugar J., Musgrove A. // J. Phys. and Chem. Ref. Data - 1988 - Vol. 17 - P. 155-239.
Shirai T. et al. // J Phys. and Chem. Ref. Data - 1987 - Vol. 16 - P. 327-377.