NUCLEAR MAGNETIC RELAXATION OF 3 AND 4 SPIN MOLECULES IN A LIQUID
NUCLEAR MAGNETIC RELAXATION OF 3 AND 4 SPIN MOLECULES IN A LIQUID
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DOI：
10.1103/physrev.109.1153
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发表时间：
1958-01-01
期刊：
影响因子：
--
通讯作者：
HUBBARD, PS
中科院分区：
文献类型：
--
作者：
HUBBARD, PS
本文利用半经典密度矩阵弛豫理论计算了液体中分子的核磁化z分量的弛豫，其中分子含有三个或四个等距相同的自旋为1 / 2的原子核，分别排列在等边三角形或四面体的角上。弛豫被认为是由于分子内偶极子-偶极子相互作用的时间依赖性，这种相互作用是由分子的经典旋转扩散引起的。研究发现，如果自旋系统的初始态以自旋温度为特征，则弛豫由随时间常数不同而呈指数衰减的两项之和组成。
The semiclassical density-matrix theory of relaxation is employed to calculate the relaxation of the z component of nuclear magnetization of molecules in a liquid for the cases in which the molecules contain either three or four equidistant identical nuclei of spin ½ arranged, respectively, at the corners of an equilateral triangle or a tetrahedron. The relaxation is assumed to be due to the time dependence of the intramolecular dipole-dipole interactions that result from the classical rotational diffusion of the molecules. It is found that, if the initial state of the spin systems is characterized by a spin temperature, the relaxation consists of the sum of two terms which decay exponentially with different time constants.