We present an apparatus that applies Ramsey's method of separated oscillatory fields to proton spins in water molecules. The setup consists of a water circuit, a spin polarizer, a magnetically shielded interaction region with various radio frequency elements, and a nuclear magnetic resonance system to measure the spin polarization. We show that this apparatus can be used for Rabi resonance measurements and to investigate magnetic and pseudomagnetic field effects in Ramsey-type precision measurements with a sensitivity below 100 pT.
@article{arxiv.2303.18108,
title = {A Ramsey apparatus for proton spins in flowing water},
author = {Ivo Schulthess and Anastasio Fratangelo and Patrick Hautle and Philipp Heil and Gjon Markaj and Marc Persoz and Ciro Pistillo and Jacob Thorne and Florian M. Piegsa},
journal= {arXiv preprint arXiv:2303.18108},
year = {2023}
}