NMR magic echo in liquid crystals by sample reorientation

Schmiedel, H.; Hillner, B.; Grande, S.

doi:10.1016/0375-9601(80)90423-5

Cited by 3 publications

(2 citation statements)

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“…It has previously been shown that a ''magic echo'' of the free-induction decay can be induced in an oriented liquid-crystalline sample by changing the angle between the director and the external magnetic field, B 0 . 18 In this communication, we demonstrate that a time reversal of spin diffusion can be achieved by switching the axis of sample rotation during a radio-frequency-driven spindiffusion experiment. 19 In rf-driven spin diffusion, a spin-lock field of strength 1S is applied to the dilute S spins ( 13 C, 15 N) during the mixing time.…”

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Reversal of radio-frequency-driven spin diffusion by reorientation of the sample spinning axis

Paul

Tomaselli

Pines

et al. 1998

The Journal of Chemical Physics

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The dipolar Hamiltonian in a rapidly rotating sample is scaled by the second Legendre polynomial of the cosine of the angle between the rotation axis and the static magnetic field. It is, therefore, possible to refocus the spatial polarization-transfer process, often termed spin diffusion, in extended spin systems by reorienting the rotor axis such that the dipolar interaction Hamiltonian changes sign. We present experimental results which demonstrate that a rapid mechanical sample reorientation leads to a time reversal of the ''radio-frequency-driven'' spin diffusion among 13 C spins.

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