分子间多量子相干横向弛豫时间(和自扩散系数)测量的参数优化和数据处理方法

THE OPTIMIZATION OF EXPERIMENTAL PARAMETER AND PROCESSING METHOD OF EXPERIMENTAL DATA FOR MEASUREMENT OF TRANSVERSE RELAXATION TIME (AND SELF-DIFFUSION COEFFICIENT) OF INTERMOLECULAR MULTIPLE QUANTUM COHERENCES IN NMR

针对测量横向弛豫时间T2 的CPMG脉冲序列和我们所设计的可同时测量高极化单组份单峰核自旋体系n阶分子间多量子相干横向弛豫时间T2 ,n和自扩散系数Dn 的改进的CRAZED脉冲序列 ,分析了影响测量T2 、T2 ,n(或Dn)的各种因素 ,并着重从技术方面讨论了准确测量T2 ,n和Dn

In light of the CPMG pulse sequence , which is used to measure the transverse relaxation time T\-2, and of modified CRAZED pulse sequence, which is designed to simultaneously measure the transverse relaxation time, T\-\{2,n\}, and self diffusion coefficient, D\-n, of intermolecular multiple quantum coherences (iMQCs) for a highly polarized spin system with only one type of spin species, all kinds of factors, which will affect the measurement of T\-2? T\-\{2,n\} (or D\-n), are analyzed. The processing method of the experimental data and the optimization of the experimental parameter for the accurate measurement of \%T\-\{2,n\}\% and \%D\-n\% of iMQCs are discussed from the point of view of technique.