Bremsstrahlung is electromagnetic radiation emitted when a charged particle accelerates during interaction with another charged particle or field. The microscopic process creates a photon, while its inverse absorbs one. Thus it contributes to a photon-number collision source in the photon number current, unlike ordinary Compton scattering. Thermal bremsstrahlung averages this emission over a thermal distribution of charged particles.
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Bremsstrahlung is a German term that translates to "braking radiation." It refers to the electromagnetic radiation emitted when charged particles, such as electrons, are accelerated or decelerated, particularly when they pass near atomic nuclei. This process occurs because the change in the velocity of the charged particle results in the emission of energy in the form of radiation, typically X-rays.