7. Transition write-off
When a charged particle (of charge ze ) with velocity β = v /c passes from a medium of permittivity ε 1 to a medium of permittivity ε 2 , the continuity of the electromagnetic field as the two media pass forces the emission of radiation, called transition radiation . This emission takes place backwards (relative to the direction of the particle), in the visible range, and forwards in the X-ray range (0-100 keV). It is this latter emission that is used to detect relativistic particles.
The amount of radiation...
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Transition write-off
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