Magnetic resonance for nonrotating fields
Magnetic resonance for nonrotating fields
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DOI：
10.1103/physrev.57.522
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发表时间：
1940-03-01
期刊：
影响因子：
--
通讯作者：
Siegert, A
中科院分区：
文献类型：
--
作者：
Bloch, F;Siegert, A
本文讨论了自旋为1/2的粒子在恒定场H 0中和在垂直于H 0的圆频率为ω的任意交变场作用下的磁共振。一种方法找到一个解决方案，在任何时候都有效，给出了更好的收敛较小的偏差从旋转场或较大的H 0。它示出，在最低阶校正的谐振曲线的形状是不变的，但它是由一个百分比量H 1 2 16 H 0 2移动，其中H 1是振荡场的有效振幅。这还涉及对由此获得的磁矩的值进行朝向较小值的校正，然而，在所有实际情况下，所述较小值小到可以忽略。
A treatment of the magnetic resonance is given for a particle with spin ½ in a constant field H 0 and under the action of an arbitrary alternating field with circular frequency ω perpendicular to H 0. A method of finding a solution, valid at any time, is given which converges the better the smaller the deviations from a rotating field or the larger H 0. It is shown that in the lowest order correction the shape of the resonance curve is unchanged but that it is shifted by a percentage amount H 1 2 16 H 0 2 where H 1 is the effective amplitude of the oscillating field. This also involves a correction in the values of the magnetic moments thus obtained towards smaller values which however in all practical cases is negligibly small.