After World War II, he helped to establish the Jülich Research Center, and he was a state representative of the Social Democratic Party of Germany.
He switched form chemistry to physics to work on the quantum mechanics of molecules as a fellow of the Notgemeinschaft der Deutschen Wissenschaft (NG; Emergency Association of German Science) at the Universität Rostock.
[1] After Habilitation, Weizel worked briefly at Badische Anilin- und Sodafabrik (BASF, Baden Aniline and Soda Factory) at Ludwigshafen.
The appointment of Wilhelm Müller – who was not a theoretical physicist, had not published in a physics journal, and was not a member of the Deutsche Physikalische Gesellschaft[4] – as a replacement for Sommerfeld, was considered such a travesty and detrimental to educating a new generation of physicists that both Ludwig Prandtl, director of the Kaiser Wilhelm Institut für Strömungsforschung ( Kaiser Wilhelm Institute for Flow Research), and Carl Ramsauer, director of the research division of the Allgemeine Elektrizitäts-Gesellschaft (General Electric Company) and president of the Deutsche Physikalische Gesellschaft, made reference to this in their correspondence to officials in the Reich.
[5] In an attachment to Ramsauer’s 20 January 1942 letter to Reich Minister Bernhard Rust, Ramsauer concluded that the appointment amounted to the “destruction of the Munich theoretical physics tradition.”[6][7][8] When Müller, as editor, published the document Jüdische und deutsche Physik, Weizel published a very critical review of the booklet pointing out its inconsistencies; his review had the support of the Faculty of Science and Mathematics at the University of Bonn.