A physicist.[ref]
https://www.nobelprize.org/nomination/archive/show.php?id=7221. Biographical identity and professional specialization
Portrait of Pieter Zeeman
. Source. The Zeeman effect connects a laboratory magnetic field to the frequencies and wave polarization of light emitted by chemical atoms. Its experimental history makes the viewing direction and spectral resolving power essential to the inference.
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Pieter Zeeman (1865-1943) was a Dutch physicist best known for his discovery of the Zeeman Effect, which describes the splitting of spectral lines in the presence of a strong magnetic field. This phenomenon occurs because the energy levels of atomic electrons are affected by the magnetic field, resulting in the observed splitting of light into different frequencies.
