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Journal Articles Comptes Rendus. Chimie Year : 2008

Nonlinear NMR dynamics in hyperpolarized liquid 3He

Emmanuel Baudin
Michael E. Hayden
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Geneviève Tastevin
Pierre-Jean Nacher

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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Dates and versions

hal-00180383 , version 1 (18-10-2007)
hal-00180383 , version 2 (28-11-2007)

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Emmanuel Baudin, Michael E. Hayden, Geneviève Tastevin, Pierre-Jean Nacher. Nonlinear NMR dynamics in hyperpolarized liquid 3He. Comptes Rendus. Chimie, 2008, 11 (4-5), pp.560 - 567. ⟨10.1016/j.crci.2007.07.005⟩. ⟨hal-00180383v2⟩
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