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 (15[1])via secondary emission. (15[1])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 (10[1])are used to map electronic band structures in ARPES. Many particle (-5[1])detectors (10[1])use light produced by scintillators to initiate this process in PMTs, which often contain alkali metals because of their small work function. (10[1])For 10 points, name this process where light causes the emission of electrons from a material. ■END■ (10[1])