Zero-to-ultra-low-field nuclear magnetic resonance (ZULF NMR) enables high-resolution spectroscopy of inhomogeneous samples in complex environments. In this work, the authors incorporate a diamond-based magnet sensor to ZULF NMR, reporting the observation of NMR signals corresponding to the hetero-nuclear J-coupling pattern of acetonitrile via signal amplification by reversible exchange (SABRE), demonstrating a magnet-free platform for detecting chemically specific NMR signals at ultra-low frequencies.
- Muhib Omar
- Jingyan Xu
- Arne Wickenbrock
