E. Brief mit U.
Autograph ist nicht mehr verfügbar
Arnold Sommerfeld (1868-1951), theoretical physicist. ALS. Munich, 14 February 1921. 2 pp. 8°. With punched holes (insignificant loss to letters) and slight traces of stapling. In German, to the Berlin physicist Rudolf Ladenburg, regarding Quantum Theory: "[...] I would be most happy if your were to publish your note in the Yearbook. In view of this, I have compressed in my ms. the relevant section. I took the liberty of questioning two passages in your ms. The invocation of the 'limiting condition' seems out of place to me. You have already precisely stated the reason why the spectrum becomes continuous. But, strictly speaking, the principle of correspondence applies only when [here follow several quantum-theoretical formulae], for example, when n changes over from 101 to 100. This, however, is an instance of an infinitely large quantum jump. Furthermore, I find your conception of a continually forced Roentgen spectrum problematic [...] Your mechanism appears too contrived. Also, the distribution of intensity and hardness in the 'deceleration spectrum' would to me not seem to follow thus. I am just giving a lecture on the application of the correspondence principle to the 'deceleration spectrum' without knowing whether I am going to make it [...]". – In 1916, Sommerfeld generalized Bohr's model of the atom to make it apply to higher atoms. He became one of the founders of quantum mechanics and was the first to apply the Special Theory of Relativity to Quantum Theory.