The thermionic emission current, \(J\), for a metal is \(J = AT^2\exp{(-\frac{\Phi}{kT})}\), where \(T\) is thermodynamic temperature, \(k\) is the Boltzmann constant, and \(\Phi\) is a work function.
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"Richardson Constant" is a constant used in developing thermionic emission current density for a metal.