Phys. Rev. Lett. 91, 067601 (2003) [4 pages]Enhancement of SQUID-Detected NMR Signals with Hyperpolarized Liquid 129Xe in a 1 μT Magnetic Field
We report an enhancement of proton NMR signals by a factor of 106 by cross polarization with hyperpolarized liquid 129Xe in an ultralow magnetic field of 1 μT. The NMR signals from cyclopentane, acetone, and methanol are detected using a commercial high-Tc SQUID magnetometer with a signal-to-noise ratio of up to 1000 from a single 90° tipping pulse. This technique allows a wide range of low-field NMR measurements and is promising for the detection of intermolecular scalar spin-spin couplings. Scalar intermolecular couplings can produce a shift of the average NMR frequency in a hyperpolarized sample even in the presence of rapid chemical exchange. © 2003 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.91.067601
DOI:
10.1103/PhysRevLett.91.067601
PACS:
76.60.–k, 85.25.Dq, 82.56.Hg, 82.56.Na
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