The dynamic nuclear polarization process
The dynamic nuclear polarization process
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DOI：
10.1016/j.nima.2004.03.147
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发表时间：
2004-06-21
影响因子：
1.4
通讯作者：
Goertz, ST
中科院分区：
文献类型：
--
作者：
Goertz, ST
动态核极化（DNP）的过程可以通过不同热容物体之间的简单热接触来定性地理解。这些天体通过对应于电子塞曼、电子偶极子-偶极子和核塞曼相互作用的三个热库来识别。初级冷却过程本身由电子塞曼储存器的非共振辐射组成，可以解释为旋转参考系中的连续且因此非绝热的退磁。为了最大化这种情况下的核极化，当所有三个物体彼此接触时（EST 模型），立即可见电子偶极储存器的热容量必须最小化。此外，这种图形描述非常有助于说明如何将完全不同的 DNP 过程方法（固体效应模型）应用到自旋温度理论中。 (C) 2004 Elsevier B.V. 保留所有权利。
The process of dynamic nuclear polarization (DNP) can be qualitatively understood by a simple heat contact between bodies of different heat capacities. These bodies are identified with the three thermal reservoirs corresponding to the electron Zeeman, the electron dipole-dipole and the nuclear Zeeman interaction. The primary cooling process itself, which consists of an off-resonance irradiation of the electron Zeeman reservoir, may be interpreted as a continuous and thus non-adiabatic demagnetization in the rotating frame of reference. In order to maximize the nuclear polarization in the case, when all three bodies are in contact with each other (EST model), it is immediately seen that the heat capacity of the electron dipolar reservoir has to be minimized. Furthermore, this graphical description is very helpful in illustrating, how the completely different approach to the DNP process, the solid effect model, can be implemented into the spin temperature theory. (C) 2004 Elsevier B.V. All rights reserved.