Pileio Giuseppe, Levitt Malcolm H
School of Chemistry, University of Southampton, University Road, Highfield, Southampton SO17 1BJ, UK.
J Magn Reson. 2008 Mar;191(1):148-55. doi: 10.1016/j.jmr.2007.11.021. Epub 2007 Dec 7.
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.
本文描述了一种用于滤除已通过各向同性自旋序项的核磁共振（NMR）信号成分的技术。该方法涉及三个射频相位角的协同循环，其中两个相位对应于描述正多面体顶点的极角，第三个角绕着一个圆逐步变化。最经济的各向同性滤波方案涉及基于四面体对称性的12步相位循环。该方法用于在溶液NMR实验中滤除已通过单重态总体的NMR信号。
