中国物理B ›› 2001, Vol. 10 ›› Issue (6): 558-563.doi: 10.1088/1009-1963/10/6/318
陈志伟1, 陈忠2, 郑绍宽3, 钟健晖4
Zheng Shao-kuan (郑绍宽)ab, Chen Zhong (陈忠)bc, Chen Zhi-wei (陈志伟)b, Zhong Jian-hui (钟健晖)c
摘要: A one-dimensional NMR method is presented for measuring the transverse relaxation time, T2,n, of intermolecular multiple quantum coherences (IMQCs) of coherence order n in highly polarized spin systems. The pulse sequence proposed in this paper effectively suppresses the effects of radiation damping, molecular diffusion, inhomogeneity of magnetic field, and variations of dipolar correlation distance, all of which may affect quantitation of T2,n. This pulse sequence can be used to measure not only IMQC transverse relaxation time T2,n (n>1) quickly and directly, but also the conventional transverse relaxation time. Experimental results demonstrate that the quantitative relationship between T2,n (n≥1) and T2 is T2,n ≈T2/n. These results will be helpful for understanding the fundamental properties and mechanisms of IMQCs.
中图分类号: (Nuclear resonance and relaxation)