Energy Level (EL) References to Original Literature:He
Helium
,
Z
=2
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Atomic Energy Level References
He II (EL)
Erickson, G. W., J. Phys. Chem. Ref. Data
6
, 831 (1977).
Garcia, J. D., and Mack, J. E., J. Opt. Soc. Am.
55
, 654 (1965).