Microtesla NMR J-coupling spectroscopy with an unshielded atomic magnetometer

TL;DR

This paper demonstrates the detection of NMR spectra in an unshielded environment using an atomic magnetometer at ultra-low fields, revealing complex J-coupling and Zeeman interactions.

Contribution

It introduces a method for microtesla NMR spectroscopy with an unshielded atomic magnetometer, combining experimental data with theoretical analysis in a challenging intermediate regime.

Findings

Successful detection of NMR spectra in unshielded environments

Complex line sets explained by J-coupling and Zeeman interactions

Operates effectively at ultra-low magnetic fields

Abstract

We present experimental data and theoretical interpretation of NMR spectra of remotely magnetized samples, detected in an unshielded environment by means of a differential atomic magnetometer. The measurements are performed in an ultra-low-field at an intermediate regime, where the J-coupling and the Zeeman energies have comparable values and produce rather complex line sets, which are satisfactorily interpreted.