Carl Wilhelm Ramsauer (February 6, 1879 in Osternburg, Oldenburg – December 24, 1955 in Berlin) was an internationally notable professor of physics and research physicist, famous for the discovery of the Ramsauer–Townsend effect. He pioneered the field of electron and proton collisions with gas molecules.
From 1907 to 1909, Ramsauer was a teaching assistant to Philipp Lenard in the physics department at the Ruprecht Karl University of Heidelberg. It was here that he conducted research on the quantum effect of the transparency of noble gases to slow electrons, known as the Ramsauer–Townsend effect. Subsequently, he was a staff scientist at the Radiological Institute in Heidelberg. During World War I, he served as an artillery officer. From 1921, he was an ordinarius professor at the Danzig Technische Hochschule.
From 1928 to 1945 he was director of the research division of the Allgemeine Elektrizitäts-Gesellschaft (AEG), an electric combine with headquarters in Berlin and Frankfurt-am-Main. During the period 1931 to 1945, in addition to his position at AEG, he was honorary professor at the Berlin Technische Hochschule; the title meant that he was authorized to teach at the facility, but not required. From 1945, he was ordinarius professor and director of the physics department at the Berlin Technische Hochschule.
From 1937, Ramsauer was chairman of the Berlin Section of the Deutsche Physikalische Gesellschaft (DPG), and from 1940 to 1945 the general chairman, i.e., president of the entire DPG. As president, Ramsauer and his deputy Wolfgang Finkelnburg took an independent course of action from the party line and against Deutsche Physik, which was anti-Semitic and had a bias against theoretical physics, especially including quantum mechanics. In taking this stance, they were supported by others, including Max Wien and Ludwig Prandtl.
Early in 1942, as chairman of the DPG, Ramsauer, with the support of Ludwig Prandtl, submitted a petition to Reich Minister Bernhard Rust, at the Reichserziehungsministerium (Reich Education Ministry). The petition, a letter and six attachments, addressed the atrocious state of physics instruction in Germany, which Ramsauer concluded was the result of politicization of education.
Ramsauer was editor of the journals Zeitschrift für technische Physik and Physik in regelmässigen Berichten. The former journal, founded in 1919, was directed to industrial physicists and engineers, and it was a publication of the German Society of Technical Physics (Deutsche Gesellschaft für technische Physik). The latter journal, founded in 1933, was a supplement to the Zeitschrift für technische Physik.
Ramsauer retired in 1955 and died shortly thereafter.
The following was published in Kernphysikalische Forschungsberichte (Research Reports in Nuclear Physics), an internal publication of the German Uranverein. Reports in this publication were classified Top Secret, they had very limited distribution, and the authors were not allowed to keep copies. The reports were confiscated under the Allied Operation Alsos and sent to the United States Atomic Energy Commission for evaluation. In 1971, the reports were declassified and returned to Germany. The reports are available at the Karlsruhe Nuclear Research Center and the American Institute of Physics.
- Carl Ramsauer Über Leistung und Organisation der angelsächsischen Physik: Mit Ausblicken für die deutsche Physik 2 April 1943. G-241.
- Carl Ramsauer Physik, Technik, Pädagogik (Braun, 1949)
- Carl Ramsauer Grundversuche der Physik in historischer Darstellung. Bd. 1. Von den Fallgesetzen bis zu den elektrischen Wellen (Springer, 1953)
- Carl Ramsauer Rudolf Kollath, and Ernst Brüche Wirkungsquerschnitt der Edelgase gegenüber langsamen Elektronen (Geest & Portig, 1954)
- Theodor Pöschl, Carl Ramsauer, and Ernst Brüche Die Physik in Einzelberichten. H. 1. Mechanik (J. A. Barth, 1956)
- Heinz Thiede, Carl Ramsauer, and Ernst Brüche Die Physik in Einzelberichten. H. 2. Praktische Akustik (J. A. Barth, 1957)
- Helmut Moser, Carl Ramsauer, and Ernst Brüche Die Physik in Einzelberichten. H. 3. Wärmelehre 1. Mit Beitr. (J. A. Barth, 1957)
- Carl Ramsauer Über den Wirkungsquerschnitt der Gasmoleküle gegenüber langsamen Elektronen, Annalen der Physik (4) 64 513-540 (1921). (Received 7 September 1920, published in issue No. 6 of 31 March 1921.)
- The Carl-Ramsauer Award in physics was instituted in honor of Ramsauer's pioneering work in industrial physics research.
- Mehra, Volume 1, Part 2, 2001, p. 620.
- Hentschel, 1966, Appendix F, pp. XLII-XLII.
- From 1932 to 1933, Ramsauer had as his assistant Otto Scherzer, who became known for his contributions to electron-bream microscopy.
- The Technische Hochschule Berlin, under a new naming convention was renamed the Technische Universität Berlin.
- Hentschel, 1966, Appendix F, pp. XLII-XLII and Appendix A, p. I.
- Hoffmann, 2005, 306 – 314.
- Beyerchen, 1977, pp. 123 – 140.
- Letter to Bernhard Rust, 20 January 1942. Document # 90 in Hentschel, 1996, pp. 278-281.
- Attachment I: American Physics Outdoes German Physics. Document #91 in Hentschel, 1996, pp. 281-284.
- Attachment II: Publications Against Modern Theoretical Physics. Cited in Hentschel, 1996, p. 279, but omitted from the anthology.
- Attachment III: The Crucial Importance of Theoretical Physics and Particularly Modern Theoretical Physics. Cited in Hentschel, 1996, p. 280, but omitted from the anthology.
- Attachment IV: Refuting Allegations that Modern Theoretical Physics is a Product of the Jewish Spirit. Document 92 in Hentschel, 1996, pp. 290-292.
- Attachment V: Excerpt from an attachment to Ludwig Prandtl's letter to Reich Marshal Hermann Göring, 28 April 1941. Cited in Hentschel, 1996, 280; see Document #85 in Hentschel, 1996, pp. 261- 266.
- Attachment VI: The Munich Conciliation and Pacification Attempt. Document #93 in Hentschel, 1996, pp. 290 – 292.
- Hentschel, 1966, Appendix F; see the entry for Carl Ramsauer.
- Hentschel, 1966, Appendix F, pp. XLII-XLII, Appendix E, pp. XVI-XVII, and Appendix A, p. I.
- Hentschel and Hentschel, 1996, Appendix E; see the entry for Kernphysikalische Forschungsberichte.
- Walker, 1993, 268.
- Walker, 1993, 274.
- John Wiley – Carl-Ramsauer Award
- Carl-Ramsauer Award - Pro-Physic
- Beyerchen, Alan D. Scientists Under Hitler: Politics and the Physics Community in the Third Reich (Yale, 1977) ISBN 0-300-01830-4
- Hentschel, Klaus, editor and Ann M. Hentschel, editorial assistant and Translator Physics and National Socialism: An Anthology of Primary Sources (Birkhäuser, 1996)
- Hoffmann, Dieter Between Autonomy and Accommodation: The German Physical Society during the Third Reich, Physics in Perspective 7(3) 293-329 (2005)
- Mehra, Jagdish, and Helmut Rechenberg The Historical Development of Quantum Theory. Volume 1 Part 2 The Quantum Theory of Planck, Einstein, Bohr and Sommerfeld 1900–1925: Its Foundation and the Rise of Its Difficulties. (Springer, 1982) ISBN 0-387-95175-X
- Walker, Mark German National Socialism and the Quest for Nuclear Power 1939–1949 (Cambridge, 1993) ISBN 0-521-43804-7