2025/01/15 by Peter Blümler, M. Fertl, Blümler, P. +7
Physics and Astronomy · Chemistry · #NMR spectroscopy and applications #Advanced NMR Techniques and Applications #Atomic and Subatomic Physics Research
paper · pdf · doi:10.48550/arxiv.2501.08936
We report on compact, gaseous 3He NMR probes for precision magnetometry of magnetic fields B > 0.1 T in the temperature range from ambient temperatures down to 4 Kelvin. The gas is polarized at thermal equilibrium under pressures up to 100 bar to provide a high nuclear spin density. In order to achieve sensor readout rates of order (Hz), paramagnetic substances and/or silica gel with high specific surface area were added to reduce the otherwise long T1 relaxation time of pure 3He gas to reach thermal polarization equilibrium. Sensitivity limits, which cover the range from 10-11 < dB/B < 10-7, are accessible in a single-pulse NMR measurement and can be further improved through signal averaging in accumulated NMR scans.