Abstract
The presence of a dielectric medium can significantly alter the mechanism of electron radiation as compared to a vacuum. For example, the radiation that is due to electrons on helical orbits in a uniform magnetic field can be split into two "branches": a vacuum branch distinguished by nv0 < 1 and a Cerenkov branch distinguished by nv0 > 1, [Here, v0 and vp are parallel and perpendicular components, respectively, of the electron velocity with respect to the magnetic field.] The spontaneous emission in a dielectric medium is a good example for deducing some general properties of spontaneous emission in a medium.
© 1992 Optical Society of America
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