Obtaining polarized liquid helium 3 from optically oriented gas

Abstract : Spin polarized liquid helium three can be obtained by liquefaction of a gas polarized by laser optical pumping. We show that this method can lead to nuclear polarizations exceeding 40 % in a liquid at about 400 mK and almost zero pressure. The relaxation time of the orientation is a few minutes, comparable to the relaxation time of weakly polarized bulk liquid. The NMR signals given by the liquid are strongly shifted in frequency ; this provides a precise and convenient way to measure the polarization and to follow the motion of the liquid inside the experimental cell.
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Submitted on : Friday, January 1, 1988 - 8:00:00 AM
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G. Tastevin, P.J. Nacher, L. Wiesenfeld, M. Leduc, F. Laloë. Obtaining polarized liquid helium 3 from optically oriented gas. Journal de Physique, 1988, 49 (1), pp.1-6. ⟨10.1051/jphys:019880049010100⟩. ⟨jpa-00210670⟩

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