Heteronuclear intermolecular single-quantum coherences in liquid nuclear magnetic resonance

作     者：陈松 朱小钦 蔡淑惠 陈忠 

作者机构：Department of PhysicsState Key Laboratory of Physical Chemistry of Solid SurfaceXiamen University School of Physics and Optoelectronics TechnologyKey Laboratory of Optoelectronic Science and Technology for MedicineMinistry of EducationFujian Normal University 

出 版 物：《Chinese Physics B》 (中国物理B（英文版）)

年 卷 期：2008年第17卷第3期

页      面：915-920页

核心收录：

学科分类：0809[工学-电子科学与技术（可授工学、理学学位）] 07[理学] 070205[理学-凝聚态物理] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0702[理学-物理学] 

基　　金：Project supported by the National Natural Science Foundation of China(Grant Nos 20573084 and 10575085) the Nation Science Foundation of Fujian,China(Grant No A0610005) the Program for New Century Excellent Talents in University of Ministry of Education of China 

主　　题：nuclear magnetic resonance heteronuclear multiple-quantum coherences distant dipolar field highly-polarized system 

摘      要：This paper analyses the heteronuclear Cosy Revamped by Asymmetric Z-gradient Echo Detection pulse sequence. General theoretical expressions of the pulse sequence with arbitrary flip angles were derived by using dipolar field treatment and signals originating from heteronuclear intermolecular single-quantum coherences （iSQCs） in highly-polarized two spin-1/2 systems were mainly discussed in order to find the optimal flip angles. The results show that signals from heteronuclear iSQCs decay slower than those from intermolecular double-quantum coherences or intermolecular zero-quantum coherences. Magical angle experiments validate that the signals are from heteronuclear iSQCs and insensitive to the imperfection of radio-frequency flip angles. All experimental observations are in excellent agreement with theoretical predictions. The quantum-mechanical treatment leads to similar predictions to the dipolar field treatment.