Delbruck scattering, the deflection of high-energy photons in the Coulomb field of nuclei as a consequence of vacuum polarization has been observed. However, the process of scattering of light by light, has not been observed. In both cases, it is a process described by Quantum Electrodynamics (QED). Image:Delbruck scattering. svg|The Feynman diagram of Delbruck scattering. The wavy line represents a photon and the double line an electron in the external field of a nucleus.
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- Delbruck scattering, the deflection of high-energy photons in the Coulomb field of nuclei as a consequence of vacuum polarization has been observed. However, the process of scattering of light by light, has not been observed. In both cases, it is a process described by Quantum Electrodynamics (QED). Image:Delbruck scattering. svg|The Feynman diagram of Delbruck scattering. The wavy line represents a photon and the double line an electron in the external field of a nucleus. Image:Delbruke scattering lowest. svg|The lowest order diagram has four vertices and consists of two incoming photons, which annihilate into a virtual electron-positron pair, which then annihilates into two real photons again.
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- Delbruck scattering, the deflection of high-energy photons in the Coulomb field of nuclei as a consequence of vacuum polarization has been observed. However, the process of scattering of light by light, has not been observed. In both cases, it is a process described by Quantum Electrodynamics (QED). Image:Delbruck scattering. svg|The Feynman diagram of Delbruck scattering. The wavy line represents a photon and the double line an electron in the external field of a nucleus.
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