Abstract
The rate of spontaneous emission of radiation by a loosely bound composite system is calculated from quantum electrodynamics correct through terms of relative order . Recent criticisms by Feinberg and Sucher of the semiclassical method of deriving the higher-order radiation coupling terms are discussed. It is proved that the Breit interaction remains valid in the presence of radiation emission and that the semiclassical and quantum-electrodynamic methods of deriving the higher-order coupling terms always yield the same results to relative order . We discuss in particular relativistic corrections to allowed and spin-forbidden electric dipole transitions and the magnetic dipole transition.
- Received 8 April 1971
DOI:https://doi.org/10.1103/PhysRevA.5.1979
©1972 American Physical Society