Instrumentation for nuclear magnetic resonance in zero and ultralow magnetic field
Abstract
We review instrumentation for nuclear magnetic resonance (NMR) in zero and ultra-low magnetic field (ZULF, below 0.1 μT) where detection is based on a low-cost, non-cryogenic, spin-exchange relaxation free (SERF) 87Rb atomic magnetometer. The typical sensitivity is 20-30 fT/Hz1/2 for signal frequencies below 1 kHz and NMR linewidths range from Hz all the way down to tens of mHz. These features enable precision measurements of chemically informative nuclear spin-spin couplings as well as nuclear spin precession in ultra-low magnetic fields.
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