Resonance-inclined optical nuclear spin polarization of liquids in diamond structures
Resonance-inclined optical nuclear spin polarization of liquids in diamond structures
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DOI：
10.1103/physrevb.93.060408
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发表时间：
2016-02-24
影响因子：
3.7
通讯作者：
Plenio, M. B.
中科院分区：
文献类型：
--
作者：
Chen, Q.;Schwarz, I.;Plenio, M. B.
室温下溶液中分子的动态核极化（DNP）有可能彻底改变核磁共振光谱和成像。用于在溶液中实现DNP的流行方法通常在电子和核自旋之间的小相互作用相关时间的范围内最有效，限制了可接近分子的大小。为了解决这个问题，我们设计了一种机制，在液相中的DNP是适用于大的相互作用相关时间。重要的是，虽然这种机制利用了类似于固态DNP的共振条件，但由于分子运动，偏振转移对共振的相对大的失谐是鲁棒的。我们结合联合收割机这一方案与光学偏振的氮空位（NV）中心自旋纳米金刚石设计的设置，采用光泵浦，因此不受室温电子热极化。我们用数值方法说明了该模型在含有固定在水凝胶中的纳米金刚石的流动池中的有效性，在0.35 T的磁场中，在当前NMR扫描仪可检测到的体积中，将流动的水分子极化4700倍以上。
Dynamic nuclear polarization (DNP) of molecules in a solution at room temperature has the potential to revolutionize nuclear magnetic resonance spectroscopy and imaging. The prevalent methods for achieving DNP in solutions are typically most effective in the regime of small interaction correlation times between the electron and nuclear spins, limiting the size of accessible molecules. To solve this limitation, we design a mechanism for DNP in the liquid phase that is applicable for large interaction correlation times. Importantly, while this mechanism makes use of a resonance condition similar to solid-state DNP, the polarization transfer is robust to a relatively large detuning from the resonance due to molecular motion. We combine this scheme with optically polarized nitrogen-vacancy (NV) center spins in nanodiamonds to design a setup that employs optical pumping and is therefore not limited by room temperature electron thermal polarization. We illustrate numerically the effectiveness of the model in a flow cell containing nanodiamonds immobilized in a hydrogel, polarizing flowing water molecules 4700-fold above thermal polarization in a magnetic field of 0.35 T, in volumes detectable by current NMR scanners.