A physicist.[ref]
https://uni-tuebingen.de/en/3260. Biographical identity and professional specialization
Portrait of Friedrich Paschen
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Friedrich Paschen (1865–1947) was a German physicist known for his contributions to spectroscopy and atomic physics. He is most famously associated with Paschen's Law, which describes the relationship between the pressure of a gas and the potential difference necessary to produce a spark across it. Paschen is particularly noted for identifying the Paschen series in the hydrogen spectrum, which concerns the wavelengths of light emitted by hydrogen when electrons transition between energy levels.