Volume 60, Number 3, November I 2002
|Page(s)||453 - 459|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||01 October 2002|
A new view of the spin echo diffusive diffraction in porous structures
Physics Department, FMF, University of Ljubljana
Jadranska 19, 1000 Ljubljana, Slovenia
and J. Stefan Institute - Jamova 39, 1000
Corresponding author: Janez.Stepisnik@fiz.uni-lj.si
Accepted: 21 August 2002
Analysis with the characteristic functional of stochastic motion is used to clarify details of the diffraction-like effect at the gradient spin echo measurement of self-diffusion in porous structures. This approach shows that the phase interference of spins rebounding at boundaries brings about the diffraction, when the mean displacement of scattered spins is equal to the phase grating caused by the applied magnetic field gradient. The diffraction patterns convey information about morphology of the surrounding media only at times long enough that boundaries restrict further spin displacements. The method explains the dependence of diffraction on the time and width of gradient pulses, as observed at the experiments and the simulations.
PACS: 76.60.Lz – Spin echoes / 61.43.Gt – Powders, porous materials / 66.30.Hs – Self-diffusion and ionic conduction in nonmetals
© EDP Sciences, 2002
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