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The Bohr–Sommerfeld model (also known as the Sommerfeld model or Bohr–Sommerfeld theory) was an extension of the Bohr model to allow elliptical orbits of electrons around an atomic nucleus. Bohr–Sommerfeld theory is named after Danish physicist Niels Bohr and German physicist Arnold Sommerfeld. Sommerfeld argued that if electronic orbits ...
Arnold Johannes Wilhelm Sommerfeld, ForMemRS [1] ( German: [ˈzɔmɐˌfɛlt]; 5 December 1868 – 26 April 1951) was a German theoretical physicist who pioneered developments in atomic and quantum physics, and also educated and mentored many students for the new era of theoretical physics.
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Nov 16, 2023 · Sommerfeld's atomic model, developed in the early 20th century, expanded on Bohr's model by introducing significant modifications to the description of the structure of atoms. Arnold Sommerfeld incorporated elliptical and asymmetric orbits for electrons, in contrast to Bohr's circular orbits.
Apr 22, 2024 · Arnold Sommerfeld (born Dec. 5, 1868, Königsberg, Prussia [now Kaliningrad, Russia]—died April 26, 1951, Munich) was a German physicist whose atomic model permitted the explanation of fine-structure spectral lines. After studying mathematics and science at Königsberg University, Sommerfeld became an assistant at the University of Göttingen ...
- The Editors of Encyclopaedia Britannica
With A. Sommerfeld’s extension of the Bohr theory in 1915–1916, it was turned into a powerful tool of atomic research and adopted and further developed by German physicists in particular. The new and more general Bohr–Sommerfeld theory described the atom in terms of two quantum numbers, while Bohr had originally used only one quantum number.
Jan 30, 2014 · Sommerfeld’s extension of Bohr’s atomic model was motivated by the quest for a theory of the Zeeman and Stark effects. The crucial idea was that a spectral line is made up of coinciding frequencies which are decomposed in an applied field. In October 1914 Johannes Stark had published the results of his experimental investigation on the splitting of spectral lines in hydrogen (Balmer lines ...
Dec 16, 2020 · Abstract. Arnold Sommerfeld extended Niels Bohr’s quantum model of the atom in order to explain the splitting of spectral lines in magnetic (Zeeman effect) and electric fields (Stark effect). Elaborating the atomic theory of spectra became a concerted effort that involved Walther Kossel (X-ray spectra), Paul Epstein and Karl Schwarzschild ...
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