EMILIO SEGRE VISUAL ARCHIVES, PHYSICS TODAY COLLECTION / AMERICAN INSTITUTE OF PHYSICS / SCIENCE PHOTO LIBRARY EMILIO SEGRE VISUAL ARCHIVES, PHYSICS TODAY COLLECTION / AMERICAN INSTITUTE OF PHYSICS / SCIENCE PHOTO LIBRARY
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Herbert Reynold Philipp (1928-2001), US physicist, examining a high-grade vacuum tube used in measuring the photoelectric emission from germanium crystals. Samples are heated by induction in the long glass arms of the tube, allowing outgassing. The samples are then moved inwards into the coated glass ball at centre, where the measurements are made. Philipp carried out a number of studies of photoelectric emission, starting in the 1950s. Photoelectric emission in germanium is related to its use as a material in semiconductors.
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