Difference between revisions of "Scattering"

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<div class="definition"><div class="short_definition">In a broad sense, the process by which matter is excited to radiate by an external source  of [[electromagnetic radiation]], as distinguished from [[emission]] of [[radiation]] by matter, which  occurs even in the absence of such a source.</div><br/> <div class="paragraph">By this definition, [[reflection]], [[refraction]], and even [[diffraction]] of [[electromagnetic waves]] are  subsumed under scattering. Sometimes scattering is applied in a restricted sense to that radiation  not accounted for by the laws of [[specular reflection]] and refraction, which are approximate because  matter is not continuous on all scales. Often the term [[scattered radiation]] is applied to that  radiation observed in directions other than that of the source and may also be applied to [[acoustic]]  and other waves. If there is no change in [[frequency]] between the incident and scattered radiation,  the scattering is sometimes said to be elastic; the converse is inelastic. Scattering is also applied to  any interaction between [[particles]] that results in a change in direction. <br/>''See'' [[multiple scattering]],  [[Mie theory]], [[Rayleigh's scattering law]].</div><br/> </div><div class="reference">Born, M., and E. Wolf 1965. Principles of Optics. 3d rev. ed., . 98&ndash;108. </div><br/> <div class="reference">Doyle, W. T. 1958. Am. J. Phys.. 53. 463&ndash;468. </div><br/>  
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<div class="definition"><div class="short_definition">In a broad sense, the process by which matter is excited to radiate by an external source  of [[electromagnetic radiation]], as distinguished from [[emission]] of [[radiation]] by matter, which  occurs even in the absence of such a source.</div><br/> <div class="paragraph">By this definition, [[reflection]], [[refraction]], and even [[diffraction]] of [[electromagnetic waves]] are  subsumed under scattering. Sometimes scattering is applied in a restricted sense to that radiation  not accounted for by the laws of [[specular reflection]] and refraction, which are approximate because  matter is not continuous on all scales. Often the term [[scattered radiation]] is applied to that  radiation observed in directions other than that of the source and may also be applied to [[acoustic wave|acoustic]]  and other waves. If there is no change in [[frequency]] between the incident and scattered radiation,  the scattering is sometimes said to be elastic; the converse is inelastic. Scattering is also applied to  any interaction between [[particles]] that results in a change in direction. <br/>''See'' [[multiple-scattering|multiple scattering]],  [[Mie theory]], [[Rayleigh's scattering law]].</div><br/> </div><div class="reference">Born, M., and E. Wolf 1965. Principles of Optics. 3d rev. ed., . 98&ndash;108. </div><br/> <div class="reference">Doyle, W. T. 1958. Am. J. Phys.. 53. 463&ndash;468. </div><br/>  
 
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Revision as of 17:50, 25 April 2012



scattering

In a broad sense, the process by which matter is excited to radiate by an external source of electromagnetic radiation, as distinguished from emission of radiation by matter, which occurs even in the absence of such a source.

By this definition, reflection, refraction, and even diffraction of electromagnetic waves are subsumed under scattering. Sometimes scattering is applied in a restricted sense to that radiation not accounted for by the laws of specular reflection and refraction, which are approximate because matter is not continuous on all scales. Often the term scattered radiation is applied to that radiation observed in directions other than that of the source and may also be applied to acoustic and other waves. If there is no change in frequency between the incident and scattered radiation, the scattering is sometimes said to be elastic; the converse is inelastic. Scattering is also applied to any interaction between particles that results in a change in direction.
See multiple scattering, Mie theory, Rayleigh's scattering law.

Born, M., and E. Wolf 1965. Principles of Optics. 3d rev. ed., . 98–108.

Doyle, W. T. 1958. Am. J. Phys.. 53. 463–468.