Spin echo formation in the presence of stochastic dynamics

Spin echo formation in magnetic field gradients in the presence of fast stochastic motion is studied for hyperpolarized 3He gas at different diffusivities. The fast translational motion leads to frequency shifts already during echo formation, which can be described analytically for a linear gradient...

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Bibliographic Details
Published inPhysical review letters Vol. 99; no. 26; p. 263001
Main Authors Zänker, Paul P, Schmidt, Jochen, Schmiedeskamp, Jörg, Acosta, Rodolfo H, Spiess, Hans W
Format Journal Article
LanguageEnglish
Published United States 31.12.2007
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Summary:Spin echo formation in magnetic field gradients in the presence of fast stochastic motion is studied for hyperpolarized 3He gas at different diffusivities. The fast translational motion leads to frequency shifts already during echo formation, which can be described analytically for a linear gradient. Despite complete signal loss at the position of the spin echo itself, considerable intensity can be preserved at an earlier time (sqrt[2]tau rather than 2tau, where tau is the pulse delay). Hence, the phenomenon is designated as a pseudo spin echo.
ISSN:0031-9007
DOI:10.1103/PhysRevLett.99.263001