Nonlinear NMR dynamics in hyperpolarized liquid 3He

Details Nonlinear NMR dynamics in hyperpolarized liquid 3He Nonlinear NMR dynamics in hyperpolarized liquid 3He

2007-10-18

arxiv.org/abs/0710.3567v2

Physics

Condensed Matter

Other Condensed Matter

Accepted for publication in C. R. Chim. (2007), doi:10.1016/j.crci.2007.07.005 v2: typo corrected in Eq. (2)

Scientific paper

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 degree 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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