论文标题
具有氮空位中心的大田间的高分辨率NMR光谱学
High-Resolution NMR Spectroscopy at Large Fields with Nitrogen Vacancy Centers
论文作者
论文摘要
在室温下，使用氮气散发（NV）中心的集合作为传感器来检测微米大小的样品的NMR信号。在这种情况下，大型磁场的状态特别有趣，因为它会导致较大的核热极化 - 因此，即使在低浓度样品中，也会产生强烈的传感器响应 - 而化学位移和J耦合变得更容易访问。尽管如此，由于与高频核信号搭配基于NV的传感器的困难，该政权在很大程度上尚未开发。在这项工作中，我们通过映射相关能量转移的方法在诱导的核自旋信号的振幅中绘制了这个问题，该方法随后转移到传感器上。该阶段散布在传感器未参与的样品核自旋的自由零售时期。因此，我们的方法最终导致高光谱分辨率受核自旋信号的连贯性限制。
Ensembles of nitrogen-vacancy (NV) centers are used as sensors to detect NMR signals from micron-sized samples at room temperature. In this scenario, the regime of large magnetic fields is especially interesting as it leads to a large nuclear thermal polarisation -- thus, to a strong sensor response even in low concentration samples -- while chemical shifts and J-couplings become more accessible. Nevertheless, this regime remains largely unexplored owing to the difficulties to couple NV-based sensors with high-frequency nuclear signals. In this work, we circumvent this problem with a method that maps the relevant energy shifts in the amplitude of an induced nuclear spin signal that is subsequently transferred to the sensor. This stage is interspersed with free-precession periods of the sample nuclear spins where the sensor does not participate. Thus, our method leads to high spectral resolutions ultimately limited by the coherence of the nuclear spin signal.
