r TPPM：通过重聚焦改进固态核磁共振双脉冲相位调制异核偶极去耦序列。
r TPPM: towards improving solid-state NMR two-pulse phase-modulation heteronuclear dipolar decoupling sequence by refocusing.
作者信息
Equbal Asif, Paul Subhradip, Mithu Venus Singh, Vinther Joachim M, Nielsen Niels Chr, Madhu P K
机构信息
Center for Insoluble Protein Structures (inSPIN), Interdisciplinary Nanoscience, Center (iNANO) and Department of Chemistry, Aarhus University, Gustav Wieds Vej 14, DK-8000 Aarhus C, Denmark.
Department of Chemistry, Center for Excellence in Basic Sciences, University of Mumbai and Department of Atomic Energy, Health Centre, University of Mumbai, Vidhyanagari Campus, Mumbai 400098, India.
出版信息
J Magn Reson. 2014 Jul;244:68-73. doi: 10.1016/j.jmr.2014.04.009. Epub 2014 Apr 24.
We present here a simple refocused modification, r TPPM, of the Two-Pulse Phase-Modulation (TPPM) heteronuclear decoupling method, which improves decoupling and makes the sequence much more robust with respect to essential experimental parameters. The modified sequence is compared with the established TPPM sequence and a variety of other decoupling sequences at low to moderate magic-angle spinning frequencies. Simulations are shown to compare TPPM and r TPPM with respect to various experimental parameters. The observations from simulations are corroborated with experimental findings at two spinning frequencies on U-(13)C-glycine and U-(13)C-L-histidine.HCl.H2O.
我们在此展示了对双脉冲相位调制（TPPM）异核去耦方法的一种简单的重新聚焦改进方法，即rTPPM，它改进了去耦效果，并使该序列在关键实验参数方面更加稳健。在低至中等魔角旋转频率下，将改进后的序列与已确立的TPPM序列以及各种其他去耦序列进行了比较。通过模拟展示了TPPM和rTPPM在各种实验参数方面的情况。模拟结果与在U-(13)C-甘氨酸和U-(13)C-L-组氨酸盐酸盐·H2O上两个旋转频率下的实验结果相印证。
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