Fast-field-cycling ultralow-field nuclear magnetic relaxation dispersion
| Autor: | Michael C. D. Tayler, Morgan W. Mitchell, Sven Bodenstedt |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Field (physics) Magnetometer Chemical physics Science General Physics and Astronomy FOS: Physical sciences 02 engineering and technology 010402 general chemistry 01 natural sciences 7. Clean energy General Biochemistry Genetics and Molecular Biology Article law.invention law Magnetic properties and materials Physics - Chemical Physics Dispersion (optics) Sensitivity (control systems) Very low frequency Larmor precession Chemical Physics (physics.chem-ph) Multidisciplinary Relaxation (NMR) Atomic and molecular interactions with photons General Chemistry 021001 nanoscience & nanotechnology Polarization (waves) 0104 chemical sciences Condensed Matter::Strongly Correlated Electrons Atomic physics 0210 nano-technology Solution-state NMR |
| Zdroj: | Nature Communications, Vol 12, Iss 1, Pp 1-8 (2021) Nature Communications |
| ISSN: | 2041-1723 |
| Popis: | Optically pumped magnetometers (OPMs) based on alkali-atom vapors are ultra-sensitive devices for dc and low-frequency ac magnetic measurements. Here, in combination with fast-field-cycling hardware and high-resolution spectroscopic detection, we demonstrate applicability of OPMs in quantifying nuclear magnetic relaxation phenomena. Relaxation rate dispersion across the nT to mT field range enables quantitative investigation of extremely slow molecular motion correlations in the liquid state, with time constants > 1 ms, and insight into the corresponding relaxation mechanisms. The 10-20 fT/\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\sqrt{{\rm{H}}}{\rm{z}}$$\end{document}Hz sensitivity of an OPM between 10 Hz and 5.5 kHz 1H Larmor frequency suffices to detect magnetic resonance signals from ~ 0.1 mL liquid volumes imbibed in simple mesoporous materials, or inside metal tubing, following nuclear spin prepolarization adjacent to the OPM. High-resolution spectroscopic detection can resolve inter-nucleus spin-spin couplings, further widening the scope of application to chemical systems. Expected limits of the technique regarding measurement of relaxation rates above 100 s−1 are discussed. Nuclear spin polarization and relaxation can be studied using nuclear magnetic resonance (NMR). Here the authors demonstrate a combination of fast-field cycling and optical magnetometry techniques, to realize a NMR sensor that operates in the region of very low frequency and high relaxation rate. |
| Databáze: | OpenAIRE |
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