Demonstration of NV-detected NMR spectroscopy at 8.3 Tesla*

High field nuclear magnetic resonance (NMR) spectroscopy offers high spectral resolution and new insights into the study of complex biomolecules. The nitrogen-vacancy (NV) center, due to its unique properties, has enabled widespread study of nanoscale NMR at low magnetic fields [1]. However, conventional NV-detected NMR based on AC magnetic field sensing is not applicable at high magnetic fields, requiring the development of alternate techniques. Furthermore, there have been few studies of NV-detected NMR at high fields due to the technical challenges involved [2]. Within this work, 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 Tesla, 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. The described technique is limited by the longitudinal relaxation time (T₁), not the transverse relaxation time (T₂). This work demonstrates a clear path to NV-detected NMR at even higher magnetic fields.