STATISTICAL MECHANICS AND THE OVERHAUSER NUCLEAR POLARIZATION EFFECT
STATISTICAL MECHANICS AND THE OVERHAUSER NUCLEAR POLARIZATION EFFECT
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统计力学和奥弗豪斯核极化效应
DOI：
10.1103/physrev.95.589
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发表时间：
1954
期刊：
影响因子：
--
通讯作者：
C. Kittel
中科院分区：
文献类型：
--
作者：
C. Kittel
P+/P=exp f2[(Ftt F)pt pr]/kt)-，-在饱和条件下，当5=i=-‘，.正如Bloch还指出的那样，增强eGect并不一定仅限于金属。甚至有可能在单个未成对电子浓度较低的材料中观察到eGect。含氢材料的辐照可为质子极化引入合适的中心，与零场分裂相关的自旋共振饱和也可增强极化。我们给出了最简单的情况，取f~1，8=1，在轴向晶态电场中电子零场分裂He。然后
P+/P= exp f2 [(ftt fs) pts pr]/kT)—,—under saturation conditions, when 5= I=-',. As noted also by Bloch, the enhancement eGect is not necessarily restricted to metals. It may even be possible to observe the eGect in materials with a low concentration of single unpaired electrons. The irradiation of hydro-genous material might introduce suitable centersfor proton polarization.It may be noted that saturation of the spin resonance associated with a zero-field splitting may also enhance polarization. We exhibit the simplest case, taking f~ 1, 8= 1, and an ele——ctronic zero-6eld split-ting hE in an axial crystalline electric field. Then