质子射频场照射对^(13)C自旋晶格弛豫的影响  

The Effect of ~1H RF Irradiation on ^(13)C Spin-lattice Relaxation

作　　者：许峰[1] 刘玉林[2] 黄永仁[3] 

机构地区：[1]淮南工业学院数理系 [2]淮南工业学院化工系,淮南232001 [3]华东师范大学分析测试中心,上海200062

出　　处：《吉林大学学报（理学版）》2002年第1期75-79,共5页Journal of Jilin University:Science Edition

基　　金：安徽省教育厅自然科学基金 (批准号 :2 0 0 1kj2 2 5zc)

摘　　要：用扩展的Solomon方程描述1H受到射频 (RF)场照射时13 C的自旋晶格弛豫过程 .理论分析表明 ,在1H受到射频场照射时 ,13 C自旋晶格弛豫通常是一个三指数过程 ,但在特定实验条件下可以变为单指数过程 .数值模拟可显示出满足TC1<TH1和TC1>TH1条件的13 C自旋晶格弛豫过程的明显差别以及不同射频场强度对13 C自旋晶格弛豫的影响 .通过实验观察固体L 缬氨酸的甲基13 C自旋晶格弛豫过程 ,测定相应的弛豫时间 .所得结果与理论分析和数值模拟完全吻合 .The extended Solomon equations are used to describe the 13 C spin lattice relaxation with the 1H RF field irradiation It is shown that the 13 C spin lattice relaxation with the 1H RF field irradiation is generally a triple exponential course, which can be reduced to a single exponential course in the absence of the 1H initial magnetization and with strong enough RF field irradiation. Based on the numerical calculation, the large difference between the spin lattice relaxation curves obeying T C 1< T H 1 and those obeying T C 1> T H 1 is indicated. The methyl 13 C resonance in L valine in the solid state is examined, whose experimental results agree well with the theoretical ones.

关 键 词：核磁共振 自旋晶格驰豫 射频场 Solomon方程 碳13 自旋温度 氢1 核极化效应 

分 类 号：O482.532[理学—固体物理]