Lilienfeld radiation, named after Julius Edgar Lilienfeld, is electromagnetic radiation produced when electrons hit a metal surface.
The Smith–Purcell effect is believed to be a variant of Lilienfeld radiation.
Lilienfeld radiation is shown as Transition radiation by Vitaly Ginzburg and Ilya Frank in 1945V. L. Ginsburg, I. M. Frank: In: J. Exp. Theoret. Phys. (UdSSR). 16, 1946, S. 15.
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