Johannes Stark (1874–1957) was a German physicist known for his work in the field of experimental physics. He is especially recognized for his research in the areas of atomic and molecular spectroscopy. One of his most notable contributions is the Stark effect, which describes the splitting of spectral lines of atoms and molecules in an external electric field. This effect is significant in the study of the behavior of atoms in electric fields and has various applications in physics and chemistry.
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