Isotropic filtering using polyhedral phase cycles: application to singlet state NMR |
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Authors: | Pileio Giuseppe Levitt Malcolm H |
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Institution: | School of Chemistry, University of Southampton, University Road, Highfield, Southampton SO17 1BJ, UK. |
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Abstract: | A technique is described for filtering out the components of an NMR signal that have passed through an isotropic spin order term. The method involves a coordinated cycle of three radiofrequency phase angles, where two of the phases correspond to the polar angles describing the vertices of a regular polyhedron, and the third angle is stepped around a circle. The most economical isotropic filtering scheme involves a 12-step phase cycle based on tetrahedral symmetry. The method is used to filter out NMR signals that have passed through singlet populations in a solution NMR experiment. |
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