Ecole Normale Supérieure, Département de Chimie, 24 rue Lhomond, 75005 Paris, France.
Solid State Nucl Magn Reson. 2011 Jul;40(1):21-6. doi: 10.1016/j.ssnmr.2011.03.004. Epub 2011 Apr 1.
The performance of two recently developed heteronuclear decoupling schemes designed to quench rotary resonance, phase-inverted supercycled sequence for attenuation of rotary resonance (PISSARRO) and high-phase two-pulse phase modulation (high-phase TPPM), are probed at high spinning frequencies. High-phase TPPM may be useful at the n=1 rotary resonance condition while PISSARRO permits efficient decoupling over a broad commonly used range of rf amplitudes, even at very high spinning frequencies. New insights into the response of spin systems to both decoupling schemes have been gained. High-phase TPPM is sensitive to the offsets of remote protons, their chemical shift anisotropies, and the relative orientations of the heteronuclear dipolar and proton chemical shift tensors. Since PISSARRO is virtually immune against such effects, the method is especially suited for very high magnetic fields.
两种最近开发的异核去耦方案的性能在高旋转频率下进行了探测，这两种方案旨在消除旋转共振，相位反转超循环序列衰减旋转共振（PISSARRO）和高相双脉冲相位调制（high-phase TPPM）。高相 TPPM 在 n=1 旋转共振条件下可能很有用，而 PISSARRO 则允许在广泛使用的射频幅度范围内实现高效去耦，即使在非常高的旋转频率下也是如此。对自旋系统对两种去耦方案的响应有了新的认识。高相 TPPM 对远程质子的偏移、它们的化学位移各向异性以及异核偶极子和质子化学位移张量的相对取向敏感。由于 PISSARRO 几乎不受这些影响，因此该方法特别适合于非常高的磁场。
