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Media type:
E-Article
Title:
Nuclear magnetic resonance in the earth's magnetic field using a nitrogen-cooled superconducting quantum interference device
Contributor:
Qiu, L.
[Author];
Zhang, Y.
[Author];
Krause, H.-J.
[Author];
Braginski, A. I.
[Author];
Burghoff, M.
[Author];
Trahms, L.
[Author]
Published:
American Institute of Physics, 2007
Published in:Applied physics letters 91, 072505 (2007). doi:10.1063/1.2771060
Language:
English
DOI:
https://doi.org/10.1063/1.2771060
ISSN:
0003-6951
Keywords:
Origination:
Footnote:
Diese Datenquelle enthält auch Bestandsnachweise, die nicht zu einem Volltext führen.
Description:
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.