All those who wear Polaroid sunglasses are familiar with the polarization of light by reflection, a phenomenon first investigated by Etienne Malus in 1808 when he looked through a calcite crystal at the light reflected from the windows of the Palais Luxembourg. In 1921 Otto Stern and Walther Gerlach demonstrated the spin polarization of atomic beams in magnetic field gradients, and their methods are now in fairly widespread use.
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© 1979 American Institute of Physics.
1979
American Institute of Physics
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