Lilienfeld radiation

Lilienfeld radiation, named after Julius Edgar Lilienfeld, is electromagnetic radiation produced when electrons hit a metal surface.

[1] The Smith–Purcell effect is believed to be a variant of Lilienfeld radiation.

[2] Lilienfeld radiation is shown as Transition radiation by Vitaly Ginzburg and Ilya Frank in 1945[3][4]

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Visible Lilienfeld radiation in an Ef89 vacuum tube .