Nuclear spin relaxation by translational diffusion in solids
Nuclear spin relaxation by translational diffusion in solids
复制标题
通过固体中的平移扩散实现核自旋弛豫
DOI：
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发表时间：
1974
期刊：
影响因子：
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通讯作者：
C. A. Sholl
中科院分区：
文献类型：
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作者：
C. A. Sholl
Torrey为最近邻跳跃模型发展了多晶固体中原子扩散的偶极弛豫理论，其中以近似方式取晶体取向的平均值。该理论在这里严格发展的形式，可以很容易地推广到单晶和更复杂的跳跃模型。作为一个例子，它示出了FCC晶格的Torrey理论给出的结果为T1，T1 ρ和T2是2.5%太大的高温和1.4%太小的低温。对于BCC晶格和配位数较低的晶格，误差较大。
Torrey has developed a theory of dipolar relaxation by atomic diffusion in polycrystalline solids for a model of nearest-neighbour jumps in which the average over crystal orientations was taken in an approximate way. The theory is developed here rigorously in a form which could be readily generalized to a single crystal and to more complicated jump models. As an example it is shown that the Torrey theory for a FCC lattice gives results for T1, T1 rho and T2 that are 2.5% too large for high temperatures and 1.4% too small for low temperatures. The errors would be larger for a BCC lattice and lattices with low coordination numbers.