Nonlinear NMR dynamics in hyperpolarized liquid 3He

Abstract : In a highly polarized liquid (laser-polarized 3He-4He mixtures in our experiment), dipolar magnetic interactions within the liquid introduce a significant nonlinear and nonlocal contribution to the Bloch equation that leads to instabilities during NMR evolution. We have launched a study of these instabilities using spin echo techniques. At high magnetizations, a simple 180° rf pulse fails to refocus magnetization, so we use a standard solid-state NMR pulse sequence: the magic sandwich. We report an experimental and numerical investigation of the effect of this sequence on unstable NMR evolution. Using a series of repeated magic sandwich sequences, the transverse magnetization lifetime can be increased by up to three orders of magnitude.
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Submitted on : Wednesday, November 28, 2007 - 12:41:03 PM
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Emmanuel Baudin, Michael Hayden, Geneviève Tastevin, Pierre-Jean Nacher. Nonlinear NMR dynamics in hyperpolarized liquid 3He. Comptes Rendus Chimie, Elsevier Masson, 2008, 11 (4-5), pp.560 - 567. ⟨10.1016/j.crci.2007.07.005⟩. ⟨hal-00180383v2⟩

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