= Arnold Sommerfeld
{wiki=Arnold_Sommerfeld}
Arnold Sommerfeld (1868–1951) was a German theoretical physicist known for his significant contributions to various fields in physics, particularly in atomic and quantum theory. He is best known for his developments in: 1. **Atomic Structure**: Sommerfeld extended Niels Bohr's model of the hydrogen atom by introducing elliptical orbits and additional quantum numbers. This improvement led to a better understanding of atomic spectra and fine structure.
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