title: Isotropic filtering using polyhedral phase cycles: application to singlet state NMR.
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.
authors.affiliation: School of Chemistry, University of Southampton, University Road, Highfield, Southampton SO17 1BJ, UK.
authors.forename: Giuseppe
authors.initials: G
authors.lastname: Pileio
authors.forename: Malcolm H
authors.initials: MH
authors.lastname: Levitt
mesh_terms: D000465:Algorithms; D016880:Anisotropy; D009682:Magnetic Resonance Spectroscopy / Q000379:methods*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D012815:Signal Processing, Computer-Assisted