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Friedrich Paschen
Louis Karl Heinrich Friedrich Paschen (22 January 1865 - 25 February 1947), was a German physicist, known for his work on electrical discharges. He is also known for the Paschen series, a series of hydrogen spectral lines in the infrared region that he first observed in 1908. He established the now widely used Paschen curve in his article ''"Über die zum Funkenübergang in Luft, Wasserstoff und Kohlensäure bei verschiedenen Drücken erforderliche Potentialdifferenz"''. He is also known for the Paschen-Back effect, which is the Zeeman effect's becoming non-linear at high magnetic field.
==Life==
Paschen was born in Schwerin, Mecklenburg-Schwerin. From 1884 to 1888 he studied at the universities of Berlin and Strassburg, after which he became an assistant at the Academy of Münster. He became a professor at the Technical Academy of Hanover in 1893 and professor of physics at the University of Tübingen in 1901. He served as president of the Physikalisch-Technischen Reichsanstalt from 1924–33 and an honorary professor of the University of Berlin in 1925.
During the second world war he had the Chinese scientist He Zehui to stay at his house and she became like a daughter to him. With his help she was introduced to Walther Bothe who led the Kaiser Wilhelm Institute in Heidelberg.〔(Zehui He: following a different road ), Cern Courier, 2011, retrieved Bebruary 2015〕
Paschen taught in Berlin until his death in Potsdam in 1947.〔"Paschen, Louis Carl Heinrich Friedrich." Complete Dictionary of Scientific Biography. 2008. Encyclopedia.com. 12 Feb. 2015 〕
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