分子内和分子间双量子相干信号随预备期的变化规律pdf.PDF

25 6 () ol. 25No.6 2009 11 Journal of Fujian Normal University ( Natural Science Edition) Nov. 2009 : 1000-5277( 2009)06-0037-05 分子内和分子间双量子相干信号随预备期的变化规律 1 2* 朱小钦 , 陈　忠 ( 1. , , , 350007; 2. , 361005) : 设计简化的三脉冲序列, 研究高极化液体核磁共振中同核自旋体系中的 子内与 子间双量子相 干信号随预备期的变化规律, 有助于更深入地理解 子内与 子间双量子相干的性质与机理, 为 离检测二 者提供理论和实验依据. 首先对普适的同核二自旋I S (p ,q = 1, 2, 3, …) 体系进行理论推导, 得到 子内与 p q 子 间多量子相干信 号与预备期的关系表达式,并利用 6种不同的自旋体系进行实验验证, 实验结果与理论 推导结果相当吻合. 这种方法还可以扩展到异核自旋体系中, 对 子结构的研究具有重要的意义. : 核磁共振; 子内与 子间双量子相干; 脉冲序列 : O641: A - - - Variations of Intra and Inter molecular Double quantum Coherences with Preparation Period 1 2* ZHU Xiao-qin , CHEN Zhong ( 1.Institute of Laser and Optoelectronics Technology , Fuj ian Provincial Key Laboratory f or Photonics Technology, Key Laboratory of OptoElectronic Science and Technology f or edicine of inistry of Education Fuj ian Normal University Fuzhou, , 350007, China; 2.Department of Physics, Xiamen University, Xiamen 361005, China) : - - bstract A three pulse sequencewas designed to investigate the variations of intra and inter-molecular double-quantum coherences with preparation period. It will help to better understand the properties and mechanism of intra- and inter-molecular multiple-quantum coherences. IpSq (p , q= 1, 2, 3, ) spin system were focused to