Deuteron spin diffusion and spin lattice relaxation in amorphous solids
Deuteron spin diffusion and spin lattice relaxation in amorphous solids
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非晶固体中的氘核自旋扩散和自旋晶格弛豫
DOI：
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发表时间：
1996
期刊：
影响因子：
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通讯作者：
H. Sillescu
中科院分区：
文献类型：
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作者：
G. Hinze;G. Diezemann;H. Sillescu
研究了自旋扩散对氘化玻璃体系中纵向磁化强度衰减的影响。测量了质子化甲苯中不同稀释度的非晶氘化甲苯的纵向磁化强度的衰减。随着稀释程度的增加，磁化强度衰减得更慢，这表明自旋扩散在氘核自旋系统中也很重要。发现自旋晶格弛豫时间分布的表观宽度与平均自旋晶格弛豫时间的绝对值之间存在很强的相关性。这种相关性可以用自旋扩散来解释。简单的模型能够重现观察到的现象的主要特征。初始衰减率与自旋扩散无关。得出了关于观察到的平均自旋晶格弛豫时间和宽度参数的频率依赖性的结论。
The effect of spin diffusion on the decay of longitudinal magnetization in deuterated glassy systems is investigated. The decay of longitudinal magnetization was measured for different dilutions of amorphous deuterated toluene in protonated toluene. For increasing dilution the magnetization was found to decay more slowly, indicating the importance of spin diffusion also in deuteron spin systems. A strong correlation between the apparent width of the distribution of spin lattice relaxation times and the absolute value of the average spin lattice relaxation time was found. This correlation can be explained in terms of spin diffusion. A simple model is able to reproduce the main features of the observed phenomena. The initial decay rates are shown to be independent of spin diffusion. Conclusions concerning the frequency dependencies of observed average spin lattice relaxation times and width parameters are drawn.