Dvinskikh Sergey V, Zimmermann Herbert, Maliniak Arnold, Sandström Dick
Division of Physical Chemistry, Arrhenius Laboratory, Stockholm University, SE-10691 Stockholm, Sweden.
J Magn Reson. 2003 Jul;163(1):46-55. doi: 10.1016/s1090-7807(03)00058-2.
We are in this work comparing the efficiencies of various 1H-13C separated local field (SLF) experiments when applied to columnar and nematic liquid crystals. In particular, the performances of the conventional SLF, proton-detected local field (PDLF), and polarization inversion spin exchange at the magic angle (PISEMA) methods in terms of spectral resolution, robustness, and ability to measure long-range couplings are investigated. The PDLF sequence provides in most cases the best dipolar resolution. This is especially obvious for weakly coupled 1H-13C spin pairs.
在这项工作中，我们比较了各种1H-13C分离局部场（SLF）实验应用于柱状和向列型液晶时的效率。特别地，研究了传统SLF、质子检测局部场（PDLF）以及魔角极化反转自旋交换（PISEMA）方法在光谱分辨率、稳健性和测量远程耦合能力方面的性能。在大多数情况下，PDLF序列提供了最佳的偶极分辨率。这对于弱耦合的1H-13C自旋对尤为明显。
