One- and two-dimensional nuclear magnetic resonance spectroscopy with a diamond quantum sensor

TL;DR

This paper demonstrates a novel diamond quantum sensor technique for one- and two-dimensional nuclear magnetic resonance spectroscopy, enabling precise identification and measurement of nuclear spins without harmonics, advancing molecular imaging capabilities.

Contribution

It introduces a method using free precession detection with nitrogen-vacancy centers for high-precision NMR spectroscopy, including 2D Fourier spectroscopy, without relying on multipulse protocols.

Findings

Unambiguous NMR species identification without harmonics

High-precision measurement of hyperfine and Larmor frequencies

Successful demonstration of 2D Fourier spectroscopy

Abstract

We report on Fourier spectroscopy experiments performed with near-surface nitrogen-vacancy centers in a diamond chip. By detecting the free precession of nuclear spins rather than applying a multipulse quantum sensing protocol, we are able to unambiguously identify the NMR species devoid of harmonics. We further show that by engineering different Hamiltonians during free precession, the hyperfine coupling parameters as well as the nuclear Larmor frequency can be selectively measured with high precision (here 5 digits). The protocols can be combined to demonstrate two-dimensional Fourier spectroscopy. The technique will be useful for mapping nuclear coordinates in molecules en route to imaging their atomic structure.