Demonstration of NV-detected NMR at 8.3 Tesla

Nuclear magnetic resonance (NMR) is an invaluable spectroscopic technique for the characterization of molecular structures. NMR at high magnetic fields is highly advantageous because of its high resolution and improved sensitivity, enabling the resolution of small chemical shifts and offering new insights into the study of complex molecules. The nitrogen-vacancy (NV) center in diamond has enabled widespread study of nanoscale NMR and electron spin resonance (ESR) at low magnetic fields [1]. However, conventional NV-detected NMR based on AC magnetic field sensing is not applicable at high fields, therefore requires the development of alternate techniques. Furthermore, there have been few studies of NV-detected NMR at high fields due to technical challenges [2]. In this presentation, we explore an NV-detected NMR technique suitable for applications of high-field NMR [3]. We demonstrate optically detected magnetic resonance (ODMR) with the NV Larmor frequency of 230 GHz at 8.3 T, corresponding to a proton NMR frequency of 350 MHz. We demonstrate the first measurement of electron-electron double resonance detected NMR (EDNMR) using the NV center and successfully detect 13C nuclear bath spins. This work demonstrates a clear path to nanoscale NMR of external spins and NV-detected NMR at even higher magnetic fields.