Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5407185 | Journal of Magnetic Resonance | 2008 | 8 Pages |
Abstract
A new portable, pocket-size NMR probe based on a novel permanent magnet arrangement is presented. It is based on a Halbach-type magnet design which mimics the field of a spherical dipole by using cylindrical bar and ring magnets. The magnet system is made up of only three individual magnets, and most field calculations and optimisations can be performed analytically. A prototype system has been built using a set of small, off the shelf commercially available permanent magnets. Proton linewidths of 50Â ppm FWHM could be achieved at a field strength of 1Â T. Calculations show that with custom-sized permanent magnets, linewidths of less than 1Â ppm can be achieved over sample volumes of up to 1Â mm3, which would in theory enable chemical shift resolved proton spectroscopy on mass-limited samples. But even with the achieved linewidth of 50Â ppm, this can be a useful portable sensor for small amounts of liquid samples with restricted molecular mobility, like gels, polymers or high viscosity liquids.
Related Topics
Physical Sciences and Engineering
Chemistry
Physical and Theoretical Chemistry
Authors
B. Manz, M. Benecke, F. Volke,