Yamamoto K, Ermakov V L, Lee D K, Ramamoorthy A
Biophysics Research Division and Department of Chemistry, University of Michigan, Ann Arbor, MI 48109-1055, United States.
Chem Phys Lett. 2005 Jun 7;408(1-3):118-122. doi: 10.1016/j.cplett.2005.04.017.
A 2D NMR method is presented for the measurement of the dipole-dipole interaction between a proton and a low-frequency nuclear spin species in the solid state under the magic angle spinning. It employs the time averaged nutation concept to dramatically reduce the required radio frequency (rf) power on the low γ nuclear channel and spin exchange at the magic angle is used to suppress (1)H-(1)H dipolar interactions and chemical shifts. The flexibility in choosing the spinning speed, rf power and the scaling factor of the pulse sequence are of considerable importance for the structural studies of biological solids. The performance of the pulse sequence has been numerically and experimentally demonstrated on several solids.
本文提出了一种二维核磁共振方法，用于在魔角旋转条件下测量固态中质子与低频核自旋物种之间的偶极-偶极相互作用。该方法采用时间平均章动概念，显著降低了低γ核通道所需的射频功率，并利用魔角处的自旋交换来抑制（1）H-（1）H偶极相互作用和化学位移。选择旋转速度、射频功率和脉冲序列的缩放因子的灵活性对于生物固体的结构研究具有相当重要的意义。该脉冲序列的性能已在几种固体上进行了数值和实验验证。
