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Science 19 July 2002:
Vol. 297. no. 5580, pp. 369 - 372
DOI: 10.1126/science.1072245
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Reports

Nonresonant Multiple Spin Echoes

Thilo M. Brill,* Seungoh Ryu, Richard Gaylor, Jacques Jundt, Douglas D. Griffin, Yi-Qiao Song, Pabitra N. Sen, Martin D. Hürlimann

Nonresonant manipulation of nuclear spins can probe large volumes of sample situated in inhomogeneous fields outside a magnet, a geometry suitable for mobile sensors for the inspection of roads, buildings, and geological formations. However, the interference by Earth's magnetic field causes rapid decay of the signal within a few milliseconds for protons and is detrimental to this method. Here we describe a technique to suppress the effects of Earth's field by using adiabatic rotations and sudden switching of the applied fields. We observed hundreds of spin echo signals lasting for more than 600 milliseconds and accurately measured the relaxation times of a liquid sample.

Schlumberger-Doll Research, 36 Old Quarry Road, Ridgefield, CT 06877, USA.
*   To whom correspondence should be addressed. E-mail: brill2{at}slb.com

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THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Ex Situ NMR in Highly Homogeneous Fields: 1H Spectroscopy.
J. Perlo, F. Casanova, and B. Blumich (2007)
Science 315, 1110-1112
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