Instruments using an “internal” form of this phenomenon are combined with lead tungstate crystals to form the CMS electromagnetic calorimeter. Products of this phenomenon are passed through a microchannel plate in image intensifiers used in night vision goggles. In one common detector, chained dynodes amplify the result of this process via (-5[1])secondary emission. This effect dominates at energies lower than those where Compton scattering and (*) pair production are favored. The energy and angle of particles created through this process are used to map electronic band structures in ARPES. Many (10[1])particle detectors use light produced by scintillators to initiate this process in PMTs, (-5[1])which often contain alkali metals because of their small work function. For 10 points, name this process where light causes the emission of electrons from a material. (10[1])■END■ (10[1])