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Applications of DNP-NMR for the measurement of heteronuclear T-1 relaxation times

机译:DNP-NMR在测量异核T-1弛豫时间中的应用

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Measurement of heteronuclear spin-lattice relaxation times is hampered by both low natural abundance and low detection sensitivity. Combined with typically long relaxation times, this results in extended acquisition times which often renders the experiment impractical. Recently a variant of dynamic nuclear polarisation has been demonstrated in which enhanced nuclear spin polarisation, generated in the cryo-solid state, is transferred to the liquid state for detection. Combining this approach with small flip angle pulse trains, similar to the FLASH-T, imaging sequence, allows the rapid determination of spin-lattice relaxation times. In this paper we explore this method and its application to the measurement of T, for both carbon-13 and nitrogen-15 at natural abundance. The effects of RF inhomogeneity and the influence of proton decoupling in the context of this experiment are also investigated. (c) 2007 Elsevier Inc. All rights reserved.
机译:低自然丰度和低检测灵敏度都阻碍了异核自旋晶格弛豫时间的测量。结合通常较长的弛豫时间,这会导致采集时间延长,这常常使实验变得不切实际。最近,已经证明了动态核极化的一种变体,其中以低温固态产生的增强的核自旋极化被转移到液态进行检测。将此方法与类似于FLASH-T成像序列的小翻转角脉冲序列相结合,可以快速确定自旋晶格弛豫时间。在本文中,我们探索了该方法及其在自然丰度下碳13和氮15中T的测量中的应用。在此实验的背景下,还研究了射频不均匀性的影响以及质子去耦的影响。 (c)2007 Elsevier Inc.保留所有权利。

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