Delbrück scattering

Delbrück scattering, the deflection of high-energy photons in the Coulomb field of nuclei as a consequence of vacuum polarization was observed in 1975. The related process of the scattering of light by light, also a consequence of vacuum polarization, was not observed until 1998. In both cases, it is a process described by quantum electrodynamics. * The Feynman diagram of Delbrück scattering. The wavy line represents a photon and the double line an electron in the external field of a nucleus. *

Delbrück scattering

Delbrück scattering, the deflection of high-energy photons in the Coulomb field of nuclei as a consequence of vacuum polarization was observed in 1975. The related process of the scattering of light by light, also a consequence of vacuum polarization, was not observed until 1998. In both cases, it is a process described by quantum electrodynamics. * The Feynman diagram of Delbrück scattering. The wavy line represents a photon and the double line an electron in the external field of a nucleus. *