Publication: Hyperfine Suppression of 2 3S1 - 3 3PJ Transitions in 3He

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Title	Hyperfine Suppression of 2 3S1 - 3 3PJ Transitions in 3He
Authors/Editors*	I.A. Sulai, Qixue Wu, M. Bishof, G.W.F. Drake, Z.-T. Lu, P. Mueller,1 and R. Santra
Where published*	Phys. Rev. Lett.
How published*	Journal
Year*	2008
Volume	100
Number
Pages	in press
Publisher
Keywords
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Abstract	Two anomalously weak transitions within the 2 3S1 â 3 3PJ manifolds in 3He have been identified. Their transition strengths are measured to be 1,000 times weaker than that of the strongest transition in the same group. This ramatic suppression of transition strengths is due to the dominance of the hyperfine interaction over the fine structure interaction. An alternative selection rule based on IS-coupling (where the nuclear spin is first coupled to the total electron spin) is proposed. This provides qualitative understanding of the ransition strengths. It is shown that the small deviations from the IS-coupling model are fully accounted for by an exact diagonalization of the strongly interacting states.