Optimization of 1H spin density for dynamic nuclear polarization using photo-excited triplet electron spins
Optimization of 1H spin density for dynamic nuclear polarization using photo-excited triplet electron spins
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DOI：
10.1016/j.jmr.2008.11.009
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发表时间：
2009-03-01
影响因子：
2.2
通讯作者：
Kitagawa, Masahiro
中科院分区：
文献类型：
--
作者：
Kagawa, Akinori;Murokawa, Yu;Kitagawa, Masahiro
在使用光激发三重态电子自旋的动态核极化（DNP）中，被称为微波诱导光学核极化（MIONP），可获得的H-1极化由累积Fate和自旋-晶格弛豫速率的比率决定，而这又取决于H-1自旋密度。结果表明，用部分氘化稀释H-1自旋可以增强最终的H-1极化。在0.05摩尔%并五苯掺杂的对三联苯中，对于各种H-1丰度，证明了DNP实验。它也表明，H-1自旋扩散系数可以确定通过检查初始建立率的H-1极化的DNP序列的各种重复率。(C)2008年爱思唯尔公司All rights reserved.
In dynamic nuclear polarization (DNP) using photo-excited triplet electron spins, known as Microwave-induced optical nuclear polarization (MIONP), the attainable H-1 Polarization is determined by the ratio of the buildup Fate and the spin-lattice relaxation rate, in turn depend on the H-1 spin density. It is shown that the final H-1 polarization can be enhanced by diluting the H-1 spins with partial deuteration. The DNP experiments are demonstrated in 0.05 mol% pentacene-doped p-terphenyl for various H-1 abundances. It is also shown that the H-1 spin diffusion coefficient can be determined by examining the initial buildup rate of H-1 polarization for Various repetition rates of the DNP sequence. (C) 2008 Elsevier Inc. All rights reserved.