Nuclear magnetic resonance in the earth's magnetic field using a nitrogen-cooled superconducting quantum interference device

Qiu, L.; Krause, H.-J.; Braginski, A. I.; Burghoff, M.; Trahms, L.; Zhang, Y.

doi:10.1063/1.2771060

Journal Article

Nuclear magnetic resonance in the earth's magnetic field using a nitrogen-cooled superconducting quantum interference device

Qiu, L.FZJ* ; Zhang, Y.FZJ* ; Krause, H.-J.FZJ* ; Braginski, A. I.FZJ* ; Burghoff, M. ; Trahms, L.

2007
American Institute of Physics Melville, NY

Applied physics letters 91, 072505 (2007) [10.1063/1.2771060]

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Please use a persistent id in citations: http://hdl.handle.net/2128/17417 doi:10.1063/1.2771060

Abstract: The authors recorded nuclear magnetic resonance (NMR) spectra of water, benzene, fluorobenzene, and 2,2,2-trifluoroethanol in the earth's magnetic field (EMF) using a nitrogen-cooled superconducting quantum interference device (SQUID). In trifluoroethanol, the broadband detection characteristics of the SQUID with a noise floor of about 70 fT/root Hz enabled authors to simultaneously observe fluorine and proton spectra at 1940 and 2060 Hz Larmor frequency, reflecting their heteronuclear J coupling in the high-field limit without showing a measurable chemical shift. To reduce the noise in EMF-NMR, the authors suggest the use of frequency-adjusted averaging, which compensates line broadening due to EMF fluctuations. (C) 2007 American Institute of Physics.

Keyword(s): J

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