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(Breaking Radiation, Free-free Radiation)
(photon emission when a charged particle is decelerated)

Bremsstrahlung (Braking Radiation) is Electromagnetic Radiation produced when a charged Particle decelerates, when its course is deflected by another charged particle. A Photon is emitted that balances the energy equation. The resulting radiation Emission has a Continuous Spectrum (Continuum Emission), as opposed, for example, to Emission Lines. It is also called Free-free Radiation in expressing the point that it is not from an electron bound to an atom.

An astronomical source of Bremsstrahlung is the Intracluster Medium associated with a Galaxy Clusters.

The reverse of Bremsstrahlung radiation is also possible, called Free-free Absorption, where an electron and another particle interact and a photon is absorbed. Free-free absorption occurs in HII Regions, affecting their spectrum.


Referenced by:
Continuum Emission
Electron Scattering
Kramers Opacity Law
Synchrotron Radiation