RT Unpublished Material DB /z-wcorg/ DS http://worldcat.org ID 82251188 LA Material mostly in German, some in English. T1 Papers, ("New" Sommerfeld Nachlass), A1 Sommerfeld, Arnold,, YR 1890 AB Correspondence, two diaries (1922-1923 and 1928-1929), and photographs. Materials mostly from the 1930s and 1940s, dealing especially with the impact of Nazi ideology and politics; institutional aspects more than scientific. Correspondents include many famous scientists as well as many unknown. Only to a minor extent is the material relevant to solid state physics. For example, letters on electron theory of metals around 1928 with Edvard Grneisen, Richard Gans, Jaeger, Robert Millikan, Carl Wilhelm Oseen, Friedrich Paschen, Arthur Holly Compton, Karl T. Compton, Thomas C. Mendenhall, and others. Letters exchanged with Peter Paul Ewald, 1915-1916, concerning X-ray diffraction theory.