Abstract
There are deep conceptual differences between the classical and quantummechanical treatment of electromagnetic radiation processes. Nevertheless, it ispossible to give a formally unified description of the spectral and angulardistribution of radiation in both cases in terms of four-dimensional Fouriertransforms of currents. We present parallel derivations of the basic radiationformulae utilizing classical electrodynamics as well as spinor quantumelectrodynamics. In addition both derivations allow for the presence of amedium with an index of refraction. The practical application of thesemethods is illustrated by calculations of some specific radiation problems.
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