a Department of Physics, Xiamen University, Xiamen 361005, China; b Department of Chemistry, State Key Laboratory for Physical Chemistry of Solid Surfaces, Xiamen University, Xiamen 361005, China; c University of Rochester Medical Center, Rochester, NY 14642, USA
AbstractA 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.
Received: 09 November 2000
Revised: 26 February 2001
Accepted manuscript online:
PACS:
33.25.+k
(Nuclear resonance and relaxation)
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos.10005006 and 19975038) and by the National Institute of Health(NIH) of United States (Grant No. NS32024).
Cite this article:
Zheng Shao-kuan (郑绍宽), Chen Zhong (陈忠), Chen Zhi-wei (陈志伟), Zhong Jian-hui (钟健晖) DIRECT MEASUREMENT OF TRANSVERSE RELAXATION TIME OF INTERMOLECULAR MULTIPLE QUANTUM COHERENCES IN NMR 2001 Chinese Physics 10 558
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