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Two anomalously weak transitions within the $2 ^3{\rm S}_1~-~3 ^3{\rm P}_J$manifolds in $^3$He have been identified. Their transition strengths aremeasured to be 1,000 times weaker than that of the strongest transition in thesame group. This dramatic suppression of transition strengths is due to thedominance of the hyperfine interaction over the fine structure interaction. Analternative selection rule based on \textit{IS}-coupling (where the nuclearspin is first coupled to the total electron spin) is proposed. This providesqualitative understanding of the transition strengths. It is shown that thesmall deviations from the \textit{IS}-coupling model are fully accounted for byan exact diagonalization of the strongly interacting states.

Hyperfine Suppression of $2^3{\rm S}_1 - 3^3{\rm P}_J$ Transitions in $^3$He