NIST Energy Levels and Wavelengths Bibliographic Reference # 10054
Theoretical Energies for the n=1 and 2 States of the Helium Isoelectronic Sequence up to Z=100
,
G. W. F. Drake
,
Can. J. Phys.
66
, 586–611 (1988)
DOI:
10.1139/p88-100
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