Mechanisms of dynamic nuclear polarization in insulating solids.

Mechanisms of dynamic nuclear polarization in insulating solids.
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DOI:
10.1016/j.jmr.2015.02.005
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发表时间:
2015-04
影响因子:
2.2
通讯作者:
Griffin, R. G.
Griffin, R. G.
中科院分区:
化学3区
文献类型:
--
作者:
Can, T. V.;Ni, Q. Z.;Griffin, R. G.

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动态核极化(DNP)是一种在核磁共振实验中通过将高极化的电子转移到其周围的核来增强信号强度的技术。在过去的十年里,DNP的发展,特别是在高磁场下,以及它在生物物理学,化学,结构生物学和材料科学等多个领域的应用,经历了一次复兴。最近的技术和理论进步扩大了我们对现有实验的理解:例如,在魔角旋转的样品中的交叉效应DNP。此外,新的实验表明,我们对奥弗豪泽效应的理解及其对绝缘固体的适用性需要重新审视。在这篇文章中,我们总结了过去几年的重要结果,并提供这些结果背后的量子力学解释。我们还讨论了DNP的未来发展方向和目前的局限性,包括在80-100 K下记录的蛋白质光谱的分辨率问题。
Dynamic nuclear polarization (DNP) is a technique used to enhance signal intensities in NMR experiments by transferring the high polarization of electrons to their surrounding nuclei. The past decade has witnessed a renaissance in the development of DNP, especially at high magnetic fields, and its application in several areas including biophysics, chemistry, structural biology and materials science. Recent technical and theoretical advances have expanded our understanding of established experiments: for example, the cross effect DNP in samples spinning at the magic angle. Furthermore, new experiments suggest that our understanding of the Overhauser effect and its applicability to insulating solids needs to be re-examined. In this article, we summarize important results of the past few years and provide quantum mechanical explanations underlying these results. We also discuss future directions of DNP and current limitations, including the problem of resolution in protein spectra recorded at 80–100 K.
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