1] Materials Sciences Division, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720, USA [2] Department of Chemistry and California Institute for Quantitative Biosciences, University of California, Berkeley, California 94720, USA.
Nat Commun. 2014 Jun 18;5:4135. doi: 10.1038/ncomms5135.
The application of magnetic resonance spectroscopy at progressively smaller length scales may eventually permit 'chemical imaging' of spins at the surfaces of materials and biological complexes. In particular, the negatively charged nitrogen-vacancy (NV(-)) centre in diamond has been exploited as an optical transducer for nanoscale nuclear magnetic resonance. However, the spectra of detected spins are generally broadened by their interaction with proximate paramagnetic NV(-) centres through coherent and incoherent mechanisms. Here we demonstrate a detection technique that can resolve the spectra of electron spins coupled to NV(-) centres, in this case, substitutional nitrogen and neutral nitrogen-vacancy centres in diamond, through optically detected cross-relaxation. The hyperfine spectra of these spins are a unique chemical identifier, suggesting the possibility, in combination with recent results in diamonds harbouring shallow NV(-) implants, that the spectra of spins external to the diamond can be similarly detected.
随着磁共振光谱技术在更小尺度上的应用，最终可能实现对材料和生物复合物表面自旋的“化学成像”。特别是，金刚石中的带负电荷的氮空位（NV(-)）中心已被用作纳米核磁共振的光学传感器。然而，由于与邻近的顺磁 NV(-)中心的相互作用，通过相干和非相干机制，检测到的自旋的光谱通常会变宽。在这里，我们展示了一种检测技术，该技术可以通过光探测交叉弛豫来分辨与 NV(-)中心耦合的电子自旋的光谱，在这种情况下，是金刚石中的替代氮和中性氮空位中心。这些自旋的超精细光谱是一种独特的化学标识符，这表明在结合了最近在含有浅 NV(-)植入物的金刚石中的结果之后，外部的金刚石自旋的光谱也可以类似地检测到。
