Center of Interdisciplinary Magnetic Resonance, National High Magnetic Field Laboratory, 1800 East Paul Dirac Drive, Tallahassee, FL 32310, USA.
J Magn Reson. 2011 Dec;213(1):196-9. doi: 10.1016/j.jmr.2011.09.015. Epub 2011 Sep 10.
A two-dimensional experiment for measuring chemical shift anisotropy (CSA) under fast magic-angle spinning (MAS) is presented. The chemical shift anisotropy evolution is amplified by a sequence of π-pulses that repetitively interrupt MAS averaging. The amplification generates spinning sideband manifolds in the indirect dimension separated by the isotropic shift along the direct dimension. The basic unit of the pulse sequence is designed based on the magic-angle turning experiment and can be concatenated for larger amplification factors.
介绍了一种在快速魔角旋转（MAS）下测量化学位移各向异性（CSA）的二维实验。通过重复中断 MAS 平均的π脉冲序列放大化学位移各向异性演化。放大在间接维度中产生旋转边带谱，沿直接维度的各向同性位移分离。脉冲序列的基本单元基于魔角翻转实验设计，可串联以获得更大的放大倍数。
