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Split in the spectral line when a magnetic field is applied.
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Non-anomalous: number of splits matches predictions of the Schrodinger equation about the number of possible states with a given angular momentum. TODO does it make numerical predictions?
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Anomalous: evidence of spin.
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http://www.pas.rochester.edu/~blackman/ast104/zeeman-split.html contains the hello world that everyone should know: 2p splits into 3 energy levels, so you see 3 spectral lines from 1s to 2p rather than just one.
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p splits into 3, d into 5, f into 7 and so on, i.e. one for each possible azimuthal quantum number.
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It also mention that polarization effects become visible from this: each line is polarized in a different way. TODO more details as in an experiment to observe this.
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Video 61. Experimental physics - IV: 22 - Zeeman effect by Lehrportal Uni Gottingen (2020) Source.
This one is decent. Uses a cadmium lamp and an etalon on an optical table. They see a more or less clear 3-split in a circular interference pattern,
They filter out all but the transition of interest.
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Video 62. Zeeman Effect - Control light with magnetic fields by Applied Science (2018) Source. Does not appear to achieve a crystal clear split unfortunately.
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Ancestors

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