Department of Chemical Sciences, Tata Institute of Fundamental Research, Homi Bhabha Road, Colaba, Mumbai 400 005, India.
J Magn Reson. 2012 Jul;220:8-17. doi: 10.1016/j.jmr.2012.04.005. Epub 2012 May 3.
We here compare the T(2)(') values of various heteronuclear dipolar decoupling schemes commonly used in solid-state nuclear magnetic resonance experiments. Swept-frequency two-pulse phase modulation scheme is shown to give longer T(2)(') values for the majority of the magic-angle-spinning frequencies and radiofrequency amplitudes considered here. The longer T(2)(') values obtained are shown to yield spectra with higher resolution in experiments, such as INADEQUATE, which incorporate spin-echo blocks. Such blocks normally constitute the indirect dimension of a multidimensional experiment during which heteronuclear dipolar decoupling is applied, thereby making the relevance of T(2)(') manifest clearly. Experimental results are shown on samples of glycine, alanine, and Aβ(42).
我们在这里比较了在固态核磁共振实验中常用的各种异核偶极解耦方案的 T(2)(') 值。结果表明，扫频双脉冲相位调制方案在大多数考虑的魔角旋转频率和射频幅度下给出了更长的 T(2)(') 值。结果表明，在包含自旋回波块的实验（如 INADEQUATE）中，所获得的更长的 T(2)(') 值可以产生具有更高分辨率的光谱。这些块通常构成多维实验的间接维度，在此期间应用异核偶极解耦，从而清楚地显示 T(2)(') 的相关性。实验结果显示在甘氨酸、丙氨酸和 Aβ(42)的样品上。
