Pierre Auger, French physicist

Pierre Auger, French physicist

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Credit: EMILIO SEGRE VISUAL ARCHIVES/AMERICAN INSTITUTE OF PHYSICS/SCIENCE PHOTO LIBRARY

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Caption: Pierre Victor Auger (1899-1993), French physicist. In 1925, Auger discovered a phenomenon that is named the Auger effect. This refers to the emission of an electron (rather than a photon of light) by an excited atom (one that has gained energy) when it reverts to its lower energy state. He also studied cosmic rays. In 1938, he described the cascade of particles produced when cosmic rays (extremely energetic particles from space) enter the Earth's atmosphere, known as an Auger shower. Auger directed the UNESCO department of mathematical and natural sciences from 1948 to 1959. Photographed in 1978.Restrictions:

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