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Science 23 February 2007:
Vol. 315. no. 5815, p. 1049
DOI: 10.1126/science.315.5815.1049o
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This Week in Science

High resolution in nuclear magnetic resonance spectroscopy requires extremely homogeneous magnetic fields, and electromagnetic shimming coils are often used to correct small inhomogeneities that persist in carefully constructed symmetric probes. For the study of large samples outside the laboratory, open-sided probes are desirable, but in such a configuration, the shim currents required to homogenize the magnetic field are prohibitively high. Perlo et al. (p. 1110, published online 11 January) surmount this problem by using an array of small permanent magnets in place of the coils. They achieve sufficient resolution with a portable open probe to resolve the relatively similar proton spectra of acetic acid and toluene, as well as the components of a mixture of water and crude oil.




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