title: Spin echo formation in the presence of stochastic dynamics.
abstract: 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.
authors.affiliation: Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany.
authors.forename: Paul P
authors.initials: PP
authors.lastname: Zänker
authors.forename: Jochen
authors.initials: J
authors.lastname: Schmidt
authors.forename: Jörg
authors.initials: J
authors.lastname: Schmiedeskamp
authors.forename: Rodolfo H
authors.initials: RH
authors.lastname: Acosta
authors.forename: Hans W
authors.initials: HW
authors.lastname: Spiess