Publication: Energy levels for the stable isotpes of atomic helium (He-4 I and He-3 I)

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Title	Energy levels for the stable isotpes of atomic helium (He-4 I and He-3 I)
Authors/Editors*	D. C. Morton, Q. X. Wu, G. W. F. Drake
Where published*	Can. J. Phys.
How published*	Journal
Year*	2006
Volume	84
Number
Pages	83-105
Publisher
Keywords
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Abstract	We calculate very accurate ab initio ionization energies for both He-4 I and He-3 I as well as the isotope shifts for n = 1 to 10, L = 0 to 7 and combined these with precise laboratory data to produce a new table of levels for He-4 I and the first table for He-3 I. We adopted an experimental ionization potential of 5945 204 290 +/- 33 MHz for He-4 I and derived 5944 890 770 +/- 33 MHz for He-3 I. Additional calculations of the magnetic perturbations of He-3 I provide the hyperfine levels, which compare favourably with the available measurements.