Zero- to ultralow-field nuclear magnetic resonance J-spectroscopy with commercial atomic magnetometers

Abstract

Zero- to ultralow-field nuclear magnetic resonance (ZULF NMR) is an alternative spectroscopic method to high-field NMR, in which samples are studied in the absence of a large magnetic field. Unfortunately, there is a large barrier to entry for many groups, because operating the optical magnetometers needed for signal detection requires some expertise in atomic physics and optics. Commercially available magnetometers offer a solution to this problem. Here we describe a simple ZULF NMR configuration employing commercial magnetometers, and demonstrate sufficient functionality to measure samples with nuclear spins prepolarized in a permanent magnet or initialized using parahydrogen. This opens the possibility for other groups to use ZULF NMR, which provides a means to study complex materials without magnetic susceptibility-induced line broadening, and to observe samples through conductive materials.

Keywords: Hyperpolarization; J-spectroscopy; Magnetometry; Nuclear Magnetic Resonance (NMR); Parahydrogen-Induced Polarization (PHIP); Signal Amplification by Reversible Exchange (SABRE); Ultralow-field NMR; ZULF NMR; Zero-field NMR.