Difference between revisions 776125286 and 796120464 on enwiki

'''Light scattering''' is a form of [[scattering]] in which [[light]] in the form of propagating energy is scattered. Light scattering can be thought of as the deflection of a [[ray (optics)|ray]] from a straight path, for example by irregularities in the propagation [[optical medium|medium]], [[light scattering by particles|particles]], or in the interface between two media. Deviations from the [[law of reflection]] due to irregularities on a surface are also usually considere(contracted; show full)es in this process is analogous to the planes of the sound waves or density fluctuations. Brillouin scattering measurements require the use of a high-contrast [[Fabry–Pérot interferometer]] to resolve the Brillouin lines from the elastic scattering, because the energy shifts are very small (< 100&nbsp;cm<sup>−1</sup>) and very weak in intensity. Brillouin scattering measurements yield the sound velocities in a material, which may be used to calculate the elastic constants of the sample.

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*[[Raman scattering]] is another form of inelastic light scattering, but instead of scattering from acoustic phonons, as in Brillouin scattering, the light interacts with optical phonons, which are predominantly intra-molecular vibrations and rotations with energies larger than acoustic phonons. Raman scattering may therefore be used to determine chemical composition and molecular structure.<ref>{{cite journal|doi=10.1146/annurev.pc.23.100172.000521|title=Inelastic Light Scattering and the Raman Effect|year=1972|last1=Peticolas|first1=W L|journal=Annual Review of Physical Chemistry|volume=23|pages=93|bibcode = 1972ARPC...23...93P }}</ref> Since most Raman lines are stronger than Brillouin lines, and have higher energies, standard spectrometers using scanning [[monochromator]]s may be used to measure them. Raman spectrometers are standard equipment in many chemical laboratories.⏎
* [[Light-by-light scattering]]

==Static and dynamic scattering==
A common dichotomy in light scattering terminology is [[static light scattering]] versus [[dynamic light scattering]]. In static light scattering, the experimental variable is the time-average intensity of scattered light, whereas in dynamic light scattering it is the fluctuations in light intensity that are studied.  Both techniques are typically encountered in the field of colloid and polymer characterization. They also have a broad range of other applications.

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*M. Mishchenko, L. Travis, A. Lacis: ''Scattering, Absorption, and Emission of Light by Small Particles'', Cambridge University Press, 2002.

==External links==
*[http://www.opticsinfobase.org/submit/ocis/OCIS_2007.pdf Optics Classification and Indexing Scheme (OCIS)], [[Optical Society of America]], 1997

[[Category:Glass physics]]
[[Category:Scattering]]
[[Category:Scattering, absorption and radiative transfer (optics)]]