Electrons, however, could not pass in the reverse direction because the plate was not heated and thus not capable of thermionic emission of electrons. Source: Internet
Cold electrodes can also spontaneously produce electron clouds via thermionic emission when small incandescent regions (called cathode spots or anode spots) are formed. Source: Internet
The negative electrostatic field created by the grid in the vicinity of the cathode would inhibit thermionic emission and reduce the current to the plate. Source: Internet
The heater is electrically isolated from the surrounding cathode and simply serves to heat the cathode sufficiently for thermionic emission of electrons. Source: Internet
The increased thermal motion of the metal atoms "knocks" electrons out of the surface, an effect called thermionic emission. Source: Internet
They use electronic conduction in the solid state as opposed to the gaseous state or thermionic emission in a high vacuum. Source: Internet