Nonresonant Multiple Spin Echoes

Autor: Richard Gaylor, Martin D. Hürlimann, Seungoh Ryu, Jacques Jundt, Pabitra N. Sen, T. M. Brill, Yi-Qiao Song, Douglas D. Griffin
Rok vydání: 2002
Předmět:
Zdroj: Science. 297:369-372
ISSN: 1095-9203
0036-8075
DOI: 10.1126/science.1072245
Popis: 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.
Databáze: OpenAIRE
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