In an EI ion source, electrons are produced through thermionic emission by heating a wire filament that has electric current running through it.
22.
The thermionic emission current density, J, rises rapidly with increasing temperature, releasing a significant number of electrons into the vacuum near the surface.
23.
When the light is turned on, the electric power heats up the cathode enough for it to emit electrons ( thermionic emission ).
24.
"' Semiconductor devices "'are electronic components that exploit the solid state as opposed to the gaseous state or thermionic emission in a high vacuum.
25.
In vacuum tubes, a "'hot cathode "'or "'thermionic cathode "'is a cathode electrode which is heated to make it emit electrons due to thermionic emission.
26.
In the limit of large current densities, " J " is given by the Child-Langmuir equation below, rather than by the thermionic emission equation above.
27.
When deposited by thermal evaporation ( deposition ), cadmium arsenide displayed the Schottky ( thermionic emission ) and Poole Frenkel effect at high electric fields.
28.
These unusual classes of compounds have allowed Dye to achieve work functions as low as 0.2 electronvolts _ low enough for thermionic emission at-80 degrees Celsius.
29.
Heavy ions can also be generated with an Ion Gun which typically uses the thermionic emission of electrons to ionize a substance in its gaseous state.
30.
The increased power dissipation at tube ends also usually means cold cathode tubes have to be run at a lower loading than their thermionic emission equivalents.
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