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7 terms
Photonics Dictionary: R
Clear All Filters x
particles x
R x
radiation length
The average length in a specific material in which a relativistic charged particle will lose 67 percent of its energy by bremsstrahlung.
radioactivity detector
An instrument used to detect radioactive materials: alpha particles or helium nuclei; beta particles or free electrons; and gamma rays, which are x-rays of very short wavelength. They may be detected...
radioluminescence
Luminescence produced by the bombardment of radiant energy such as x-rays, radioactive waves or alpha particles.
Rayleigh scattering
Rayleigh scattering is a phenomenon that occurs when light waves interact with particles or molecules that are much smaller than the wavelength of the light. It is named after the British scientist...
residual blue
The optical phenomenon in which white light dispersed by small particles in suspension appears blue when viewed through a suitable Nicol prism.
resonance absorption (light)
The re-emission of absorbed energy, having the same wavelength as the incident energy, in an arbitrary direction from a particle because of an energy level transition within the material.
resonance radiation
That radiation emitted by an atom or molecule that has the same frequency as that of an incident particle; e.g., a photon. It generally involves a transition to the lowest energy level of the atom or...
Photonics Dictionary
R
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