质子射频场照射对碳－13自旋晶格弛豫的影响  

The Effect of￣1H RF Irradiation on￣(13)CSpin-Lattice Relaxation

作　　者：周进元[1] 傅日强 李丽云[1] 叶朝辉[1] 

机构地区：[1]中国科学院武汉物理研究所

出　　处：《Chinese Journal of Chemical Physics》1995年第1期10-17,共8页化学物理学报（英文）

摘　　要：用推广的Ｓｏｌｏｍｏｎ方程描述了１Ｈ通道加上射频场的１３Ｃ自旋晶格弛豫．分析表明在１Ｈ射频照射下１３Ｃ自旋晶格弛豫通常是一个三指数过程，但是在一些实验条件下可以变为单指数的；数值计算给出了满足和满足的１３Ｃ自旅晶格弛豫过程的明显差别．并显示了不同射频场强度的影响．实验观测了固体Ｌ－缬氨酸的甲基１３Ｃ自旋晶格弛豫，所得结果与理论分析很好符合．Abstract The extended Solomon equations are used to describe the ￣13C spin-lattice relaxation with the 1H RF field irradiation.It is shown that the 13C spin-lattice rclaxation under the 1H RFirradiahon is generally a triple-exponential course, but can be reduced to single-exponential in the absence of the 1H initial magnetizations and with strong enough RF field irradiation. Based on the numerical calculation, the large difference between the spin-lattice relaxation curves obeying and those obeying is indicated. The methyl 13C resonances in L-Valine in the solid state are examined, whose experimental results agree well with the theoretical ones

关 键 词：碳13 自旋晶格弛豫 质子射频场 

分 类 号：O613.71[理学—无机化学]