Publication: Hyperfine Suppression of 2(3)S(1)-3(3)P(J) Transitions in He-3

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Title	Hyperfine Suppression of 2(3)S(1)-3(3)P(J) Transitions in He-3
Authors/Editors*	I. A. Sulai, Qixue Wu, M. Bishof, G. W. F. Drake, Z.-T. Lu, P. Mueller, and R. Santra
Where published*	Physical Review Letters
How published*	Journal
Year*	2008
Volume	101
Number	17
Pages	173001
Publisher	American Physical Society
Keywords	HELIUM FINE-STRUCTURE; ISOTOPE SHIFT; STATE; INTERVALS
Link	http://prl.aps.org.ezproxy.uwindsor.ca/abstract/PRL/v101/i17/e173001
Abstract	Two anomalously weak transitions within the 2â3S1-3â3PJ manifolds in 3He have been identified. Their transition strengths are measured to be 1000 times weaker than that of the strongest transition in the same group. This dramatic 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 transition 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.