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The magnetic cleavage of the spectral lines is dependent on the size of the charge of the electron, or, more accurately, on the ratio between the mass and the charge of the electron.

谱线的磁劈理依赖于电子电荷的大小，或者更准确地说，依赖于质量和电子电荷的比值。

— Pieter Zeeman 彼得·塞曼