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Electromagnetic radiation accompanying the breaking of contact between polymer films (such as cellulose esters, polyvinylchloride, and rubber), the surface of dielectrics (such as glass, polyethyleneterephthalate), and a conductor (e.g., steel) in both the visible and radio-frequency ranges is studied. The experiments were conducted at room temperature within the pressure range of 10-2 torr up to 1 atm. The experiments have shown that glow and radio-frequency radiation pulses are produced simultaneously and have the same duration (about 10-3-10-4 s). The radio-frequency radiation intensity depends upon the kind and pressure of the surrounding gaseous medium. The intensity of the radio-frequency radiation and the glow depends upon the nature of the components of an adhesion pair and the rate of the contact breaking.