1. The elecrons can be provided by thermionic emission and / or secondary emission. 2. The incandescent regions contribute free electrons via thermionic emission , and ( easily ionized ) metal vapor. 3. Plasma is produced via discharge from a barium-oxide coated cathode, which emits electrons via thermionic emission . 4. Current in the arc is sustained by thermionic emission and field emission of electrons at the cathode. 5. This " shadow " led to discovery of Thermionic emission , the basis for Vacuum tubes and electronics. 6. Thermionic emission can be used to measure the work function of both the hot emitter and cold collector.7. In Bethe's theory, the current is limited by thermionic emission of electrons over the metal semiconductor potential barrier. 8. Hot metal will emit electron via Thermionic emission . talk ) 17 : 48, 18 November 2008 ( UTC) 9. Cold cathode lamps are generally less efficient than thermionic emission lamps because the cathode fall voltage is much higher. 10. In this case, the emission current is regulated by the thermionic emission process, given by the Richardson Dushman equation.
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