| Reference Label | Details |
|---|---|
| est unc | estimated uncertainty |
| Kelly 1987 | R. L. Kelly, "Atomic and Ionic Spectrum Lines below 2000 Angstroms: Hydrogen through Kryton", J. Phys. Chem. Ref. Data 16, Suppl. 1 (1987) Note: Parts I through III Erratum: J. Phys. Chem. Ref. Data 17, 953-953 (1988) [DOI: 10.1063/1.555807] |
| Chung 1992 | K. T. Chung, Phys. Rev. A 45, 7766-7773 (1992) Ionization Potential for the Lithiumlike 1s2 2s States from Na IX to Ca XVIII |
| Bashkin 1975 | S. Bashkin and J. O. Stoner, Jr., Atomic Energy Level and Grotrian Diagrams, Vols. I and II, Elsevier: New York (1975) |