NUCLEAR INDUCTION
NUCLEAR INDUCTION
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DOI：
10.1103/physrev.70.460
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发表时间：
1946-01-01
期刊：
影响因子：
--
通讯作者：
BLOCH, F
中科院分区：
文献类型：
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作者：
BLOCH, F
正常物质中原子核的磁矩在恒定磁场中建立平衡时将导致原子核顺磁极化。它示出，在直角的恒定场的射频场导致强制进动的总极化周围的恒定场随着纬度降低的拉莫尔频率的方法的射频场的频率。因此，有结果的一个组成部分，在直角的恒定和射频场的核极化，它表明，在正常的实验室条件下，该组件可以引起可观察到的电压。在第3节中，我们讨论了这种核感应，只考虑外部场的影响，而在第4节中，这些修改描述了源于内部场和有限的弛豫时间。
The magnetic moments of nuclei in normal matter will result in a nuclear paramagnetic polarization upon establishment of equilibrium in a constant magnetic field. It is shown that a radiofrequency field at right angles to the constant field causes a forced precession of the total polarization around the constant field with decreasing latitude as the Larmor frequency approaches adiabatically the frequency of the rf field. Thus there results a component of the nuclear polarization at right angles to both the constant and the rf field and it is shown that under normal laboratory conditions this component can induce observable voltages. In Section 3 we discuss this nuclear induction, considering the effect of external fields only, while in Section 4 those modifications are described which originate from internal fields and finite relaxation times.