在固态 NMR 中选择异核偶极解耦方案。
On the choice of heteronuclear dipolar decoupling scheme in solid-state NMR.
机构信息
Department of Chemical Sciences, Tata Institute of Fundamental Research, Homi Bhabha Road, Colaba, Mumbai 400 005, India.
出版信息
J Magn Reson. 2010 Nov;207(1):140-8. doi: 10.1016/j.jmr.2010.08.023. Epub 2010 Sep 9.
We present here a comparison of different heteronuclear dipolar decoupling sequences at the moderate magic-angle spinning (MAS) frequency (ν(r)) of 30 kHz. The radio-frequency (RF) amplitude (ν₁) ranges from the low power (ν₁<ν(r)) to the high power regime (ν₁>2ν(r)) and includes the rotary resonance conditions (ν₁=nν(r)) where n=1, 2. For decoupling at the rotary resonance condition, we recently introduced a modification of TPPM, namely high-phase TPPM, whose properties will be discussed here. Finally, based on earlier published and current experimental results we suggest the optimal sequence for heteronuclear dipolar decoupling at any RF amplitude and MAS frequencies up to 35 kHz.
我们在此展示了在 moderate magic-angle spinning (MAS) 频率（ν(r)）为 30 kHz 的条件下，不同的异核偶极解耦序列的比较。射频（RF）幅度（ν₁）的范围从低功率（ν₁<ν(r)）到高功率（ν₁>2ν(r)），并包括旋转共振条件（ν₁=nν(r)），其中 n=1, 2。对于在旋转共振条件下的解耦，我们最近引入了 TPPM 的一种改进，即高相 TPPM，其特性将在此处讨论。最后，根据早期发表的和当前的实验结果，我们建议在任何射频幅度和高达 35 kHz 的 MAS 频率下进行异核偶极解耦的最佳序列。
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