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| {{nofootnotes|date=December 2010}}
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| {{Science with neutrons}}
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| '''Inelastic neutron scattering''' is an experimental technique commonly used in [[condensed matter physics|condensed matter research]] to study atomic and molecular motion as well as magnetic and crystal field excitations.
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| It distinguishes itself from other [[neutron scattering]] techniques by resolving the change in kinetic energy that occurs when the collision between neutrons and the sample is an [[inelastic scattering|inelastic]] one. Results are generally communicated as the [[dynamic structure factor]] (also called inelastic scattering law) <math>S(\mathbf{Q},\omega)</math>, sometimes also as the [[dynamic susceptibility]] <math> \chi^{\prime \prime}(\mathbf{Q},\omega)</math> where the scattering vector <math>\mathbf{Q}</math> is the difference between incoming and outgoing [[wave vector]], and ''<math>\hbar \omega</math>'' is the energy change experienced by the sample (negative that of the scattered neutron). When results are plotted as function of <math>\omega</math>, they can often be interpreted in the same way as spectra obtained by conventional [[spectroscopy|spectroscopic]] techniques; insofar as inelastic neutron scattering can be seen as a special spectroscopy.
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| [[Image:inelastic-neutron-scattering-basics.png|thumb|left|500px|Generic layout of an inelastic neutron scattering experiment]]
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| Inelastic scattering experiments normally require a monochromatization of the incident or outgoing beam and an energy analysis of the scattered neutrons. This can be done either through time-of-flight techniques ([[neutron time-of-flight scattering]]) or through [[Bragg reflection]] from single crystals ([[neutron triple-axis spectroscopy]], [[neutron backscattering]]). Monochromatization is not needed in echo techniques ([[neutron spin echo]], [[neutron resonance spin echo]]), which use the quantum mechanical [[phase (waves)|phase]] of the neutrons in addition to their amplitudes.
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| == See also ==
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| * [[Inelastic scattering]]
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| ==Further Information==
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| Literature:
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| * G L Squires ''Introduction to the Theory of Thermal Neutron Scattering'' Dover 1997 (reprint?)
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| ==External links==
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| * [http://iffwww.iff.kfa-juelich.de/~wuttke/doku/lib/exe/fetch.php?id=spheres%3Aprinciple&cache=cache&media=spheres:np9v05.pdf Joachim Wuttke: Introduction to Inelastic Crystal Spectrometers]
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| * [http://neutronsources.org Neutronsources.org] - Collaboration website of all neutron facilities
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| * [http://nmi3.eu Integrated Infrastructure Initiative for Neutron Scattering and Muon Spectroscopy (NMI3)] - a European consortium of 18 partner organisations from 12 countries, including all major facilities in the fields of neutron scattering and muon spectroscopy
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| [[Category:Neutron scattering]]
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| [[de:Neutronenstreuung]]
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Revision as of 07:33, 1 March 2014
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