Spin diffusion and nuclear spin-lattice relaxation in irradiated solids: a multiple-pulse NQR study

被引：5

作者：

Furman, GB ^{[1
]}

Goren, SD ^{[1
]}

Panich, AM ^{[1
]}

Shames, AI ^{[1
]}

机构：

[1] Ben Gurion Univ Negev, Dept Phys, Beersheba, Israel

来源：

SOLID STATE NUCLEAR MAGNETIC RESONANCE | 1999年 / 14卷 / 3-4期

基金：

以色列科学基金会;

关键词：

NQR; relaxation; spin diffusion; paramagnetic impurities;

D O I：

10.1016/S0926-2040(99)00026-0

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

We present a detailed theoretical and experimental NQR multiple-pulse spin-locking study of spin-lattice relaxation and spin diffusion processes in the presence of paramagnetic impurities in solids. The relaxation function of the nuclear spin system at the beginning of the relaxation process is given by exp (- t/T-ip)(alpha), where T-1 rho is spin-lattice relaxation time in rotating frame and alpha = d/6, d is the sample dimensionality. Then the relaxation proceeds asymptotically to an exponential function of time, which was attributed to the spin-diffusion regime. Using the experimental data obtained from the analysis of those two relaxation regimes in gamma-irradiated powdered NaClO3, spin diffusion coefficient has been determined and the radius of the diffusion barrier has been estimated. (C) 1999 Elsevier Science B.V. All rights reserved.

引用

页码：145 / 155

页数：11

共 21 条

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