Otto Stern, German-US physicist

Otto Stern, German-US physicist

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Credit: Emilio Segre, courtesy AIP Emilio Segre Visual Archives /SCIENCE PHOTO LIBRARY

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Caption: Otto Stern (1888-1969), German-US physicist. Stern's main research was on molecular beams. In 1920 he worked with Walter Gerlach, using a molecular beam of silver atoms to test a prediction of quantum theory. The prediction was that the atoms had magnetic moments that were quantized into two orientations. The beam split into two as predicted and earned Stern the 1943 Nobel Prize for Physics. Stern also measured the magnetic moment of the proton and successfully observed diffraction of atoms and molecules, demonstrating wave-particle duality. Photographed at the Copenhagen Conference at the Niels Bohr Institute, University of Copenhagen, Denmark, in 1934.

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