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An ion or electron emitted by a substance at high temperature.
- ‘When the main power supply of the X-ray tube is on, the cathode emits thermions as it is heated by a heater.’
- ‘If the ionization electrode is located at an appropriate position in the vicinity of the evaporation source and a positive voltage with respect to that of the evaporation source is applied to the electrode, thermions and secondary electrons from the evaporation source migrate toward the ionization electrode.’
- ‘Alloyed thorium enhances the emission of thermions by lowering the work function barriers.’
- ‘Another theory is that, since energy is required to extract electrons from the heated material, there should be cooling when thermions are emitted.’
- ‘He discovered the Schottky effect, an irregularity in the emission of thermions in a vacuum tube and invented the screen-grid tetrode tube.’
Early 20th century: from thermo- of heat + ion.
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