If the velocity of an electron traversing a ponderable medium exceeds the velocity of light in the medium the electron emits a coherent radiation even if it moves with a constant velocity. Frank and Tamm have shown in 1937 that the peculiar visible radiation emitted by liquids and solids bombarded by fast electrons, which was discovered by Cerenkov in 1934, is of this nature.
CITATION STYLE
Tamm, Ig. (1991). Radiation Emitted by Uniformly Moving Electrons. In Selected Papers (pp. 37–53). Springer Berlin Heidelberg. https://doi.org/10.1007/978-3-642-74626-0_3
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