【作者】 朱小钦； 吕迎阳； 陈希； 陈忠；

【Author】 ZHU Xiao-qin LU Ying-yang CHEN Xi CHEN Zhong~* (Department of Physics,State Key Laboratory for Physical Chemistry of Solid Surface,Xiamen University,Xiamen 361005)

【机构】 厦门大学物理系,固体表面物理化学国家重点实验室；

【摘要】 <正>分子内的标量耦合与分子间残留的偶极耦合都能产生多量子相干信号。对于标量耦合和偶极耦合都很明显的高自旋体系,由多脉冲实验产生的来自分子内多量子相干的信号中通常都会混有来自分子间多量子相干的信号。这样得到的信号较为复杂,不便于进行所包含的分更多还原

【Abstract】 Both intra-molecular scalar couplings(J couplings)and inter-molecular residual dipolar couplings(D couplings)can induce multiple-quantum coherences(MQC).For a highly polarized system with scalar couplings,both D-and J-couplings are significant in solution NMR.The signals attributed from both couplings result in much more complex spectral pattern.When a pulse sequence is used to detect the signals from intra-molecular MQCs,the signals may mix with inter-molecular MQCs.Therefore,it is very important and meaningful to separate and detect the signals originating from intra-and inter-molecular MQCs.A pulse sequence shown in Fig.1 was designed for this purpose.When the second pulse is set to a proper flip angle,the intra-and inter-molecular MQC for I_pS_q system with different I spin number p can be separated and detected. The analytical expressions,simulated results,and experimental observations are matched well.The method proposed herein will be extended to heteronuclear cases.更多还原