The application of the Bohr correspondence principle to quantum electrodynamics is considered, taking into account the existence of the scattering of light by light and of intensity-dependent radiative corrections. When the effect of the latter is allowed for, the discrepancy between completely quantum-mechanical and completely classical calculations of Thomson scattering is removed.

• Received 1 August 1966

DOI:https://doi.org/10.1103/PhysRev.152.1135