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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.
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.