Task id14244
Derive the Richardson-Deshman formula that determines the current density of electrons emitted by the thermionic cathode J = AT2exp(-j/kBT), where the constant A = 4пmekB2/h3 = 120 • 104 A/(m2K2). The value j is the work function, which depends on the cathode material and on the state of the surface of the material and is usually expressed in eV.
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