NASA NTRS · 19690062794
Singlet-triplet mixing in the helium sequence.
Abstract
Off-diagonal matrix elements of Breit interaction between singlet-triplet transitions for helium isoelectronic sequences
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Drake, G. W. F.. 1969-05-05. Singlet-triplet mixing in the helium sequence.. https://ntrs.nasa.gov/citations/19690062794
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