‎"KRAMERS, H.A.‎
‎Intensities of Spectral Lines on the Application of the Quantum Theory to the Problem of the relative Intensities of the Components of the fine Structure and of the Stark Effect of the Lines of the Hydrogen Spectrum. - [KRAMERS THE DOCTORAL THESIS]‎

‎København, Andr. Fred. Høst, 1919. 4to. Uncut, unopened in the original printed wrappers. Offprint from ""Memoires de L'Academie Royale des Sciences et des Letteres de Danemark"". Light miscolouring to extremities. Otherwise a very fine and clean copy. Pp. 287-384, XVI + 4 plates.‎

Reference : 47628

‎Offprint issue of Kramer's doctorial thesis. Kramer was Niels Bohr's first assistent when Bohr's Institute opened in 1920, later he returned to Utrecht and became sucessor to Ehrenfest. - The frequency of spectral lines did not coincide with a kinetic frequency of electrons, but was only partly explained by Bohr's correspondence principle. Kramers developed here in this work the mathematical formalism required to unite these ideas, leading to an interpretation of the intensities of Stark Components.""In his 1919 dissertation, Kramers calculated in detail the intensities and polarizations of the hydrogen spectral lines, including Zeeman and Stark effects. His results were in good, if not perfect, agreement with experimental data"". (Kragh, Quantum Generations, P. 157).‎