习题i

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1. 什么是核磁共振?要满足哪些条件才能观察到核磁共振现象? 要观察到核磁共振现象需满足什么条件? 2. 以下核中哪些核可观察到核磁信号 3.一核磁谱仪的磁场强度为 14.092 特斯拉,求下述核的工作频率: 1

H, 13C, 19F, 31P, 15N

γ 1

108radT-1S-1

H

13

C

19

F

2.675 0.673

31

P

2.517

15

N

1.083

-0.2712

4 对质子来说 (I=1/2),当 T = 300°K,600MHz 谱仪 N β0 /N 0α = ?

5. 在外磁场下,忽略驰豫作用,磁化矢量的运动方程是

dM/dt=

(M×B0)

(a)

写出磁化矢量三个分量的运动方程

(b)

写出旋转坐标系中的 Bloch 方程

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