Title: 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 $\mu$T) where detection is based on a
low-cost, non-cryogenic, spin-exchange relaxation free (SERF) $^{87}$Rb atomic
magnetometer. The typical sensitivity is 20-30 fT/Hz$^{1/2}$ 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.