首页>
外国专利>
Singlet-state exchange NMR spectroscopy for the study of very slow dynamic proceses
Singlet-state exchange NMR spectroscopy for the study of very slow dynamic proceses
展开▼
机译：单重态交换NMR光谱用于研究非常慢的动力学过程
展开▼
页面导航
摘要
著录项
相似文献
摘要
A nuclear magnetic resonance (NMR) method for singlet-state exchange NMR-spectroscopy comprises steps of excitation of single-quantum in-phase coherences, generation of single-quantum anti-phase coherences, excitation of zero-quantum coherences ZQx and/or longitudinal two-spin order 2IzSz (=“ZZ order”) using a π/4 pulse, reversal of the sign of the zero-quantum coherences ZZQx under the effect of the difference of the chemical shifts of the examined spins, transformation of the zero-quantum coherences ZZQx and/or longitudinal two-spin ZZ order into singlet-state populations by means of RF irradiation during a mixing period τm reconversion of the singlet-state populations remaining at the end of the mixing period τm into zero-quantum coherences ZZQx and/or ZZ order, reversal of the sign of the zero-quantum coherences ZZQx under the effect of the difference of the chemical shifts of the examined spins, and reconversion of zero-quantum coherences ZZQx and/or ZZ order into single-quantum anti-phase coherences. With the broadband method for the excitation of single state population, NMR can monitor correlations between states that are connected through very slow processes
展开▼
机译：用于单态交换NMR光谱的核磁共振（NMR）方法包括以下步骤：激发单量子同相相干，产生单量子反相相干，激发零量子相干ZQ x使用π/ 4脉冲的和/或纵向2轴自旋2I z S z （=“ ZZ阶”），将正负号反转零量子相干性ZZQ x 在所检查的自旋化学位移差异，零量子相干性ZZQ x 和/或纵向二元相变的影响下在混合周期τ m 中通过RF辐照将ZZ阶旋转为单态态种群混合时期τ m 结束时剩余的单态态种群的转化分为零量子相干ZZQ x 和/或ZZ阶，在零化学位移的影响下零量子相干ZZQ x 的符号反转考试的自旋，并将零量子相干ZZQ x 和/或ZZ阶转换为单量子反相相干。利用宽带方法激发单态种群，NMR可以监视通过非常缓慢的过程连接的状态之间的相关性
展开▼
