Department of Chemistry, University of California, Berkeley, Berkeley, CA 94720, USA.
Universidad Nacional de Córdoba, Facultad de Matemática, Astronomía, Física y Computación, and CONICET, Instituto de Física Enrique Gaviola, X5000HUA Córdoba, Argentina.
J Magn Reson. 2021 Oct;331:107021. doi: 10.1016/j.jmr.2021.107021.
The emergence of a new class of optically polarizable electronic spins in diamond, nitrogen vacancy (NV) defect centers, has opened interesting new avenues for dynamic nuclear polarization. Here we review methods for the room-temperature hyperpolarization of lattice C nuclei using optically pumped NV centers, focusing particular attention to a polarization transfer via rotating-frame level anti-crossings. We describe special features of this optical DNP mechanism at low-field, in particular, its deployability to randomly oriented diamond nanoparticles. In addition, we detail methods for indirectly obtaining high-resolution NV ESR spectra via hyperpolarization readout. These mechanistic features provide perspectives for interesting new applications exploiting the optically generated C hyperpolarization.
钻石中的新型光学极化电子自旋——氮空位（NV）缺陷中心的出现，为动态核极化开辟了有趣的新途径。在这里，我们回顾了使用光泵浦 NV 中心实现室温晶格 C 核超极化的方法，特别关注通过旋转框架能级反交叉进行极化转移。我们描述了该光学 DNP 机制在低场下的特殊性质，特别是它在随机取向的钻石纳米颗粒中的可应用性。此外，我们还详细介绍了通过超极化读出间接获得高分辨率 NV ESR 光谱的方法。这些机制特征为利用光学产生的 C 超极化的有趣新应用提供了前景。
