NIST Physical Measurement Laboratory Handbook of Basic Atomic Spectroscopic Data

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References and Notes for Barium ( Ba )

KFW02     J. Z. Klose, J. R. Fuhr, and W. L. Wiese J. Phys. Chem Ref. Data, 31, 217 (2002). 

KL99      H. Karlsson and U. Litzén, Phys. Scr. 60, 321 (1999). 

PVHA85    B. H. Post, W. Vassen, W. Hogervorst, M. Aymar, and O. Robaux, J. Phys. B 18, 187 (1985). The value for the Ba I ionization energy quoted here is 0.01 cm-1 higher than the value given in this reference, as suggested in [KL99] on the basis of an improved value for the 6s5d 3D1 level.