Inelastic neutron scattering


Inelastic neutron scattering

Inelastic neutron scattering is an experimental technique commonly used in condensed matter research to study atomic and molecular motion as well as magnetic and crystal field excitations.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 one. Results are generally communicated as the inelastic scattering law "S(q,ω)", sometimes also as the dynamic susceptibility "χ(q,ω)" where the scattering vector "q" is the difference between incoming and outgoing wave vector, and "hbar omega" is the energy change experienced by the sample (negative that of the scattered neutron). When results are plotted as function of "ω", they can often be interpreted in the same way as spectra obtained by conventional spectroscopic techniques; insofar as inelastic neutron scattering can be seen as a special spectroscopy.

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 of the neutrons in addition to their amplitudes.

Types of Inelastic Neutron Scattering

* neutron triple-axis scattering

* neutron time-of-flight scattering

* neutron backscattering

* neutron spin echo

Further Information

Literature:
* G L Squires "Introduction to the Theory of Thermal Neutron Scattering" Dover 1997 (reprint?)

Online Ressources:
* [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]


Wikimedia Foundation. 2010.

Look at other dictionaries:

  • Neutron scattering — Science with Neutrons Foundations Neutron temperature Flux · Radiation  …   Wikipedia

  • Neutron detection — is the effective detection of neutrons entering a well positioned detector. There are two key aspects to effective neutron detection: hardware and software. Detection hardware refers to the kind of neutron detector used (the most common today is… …   Wikipedia

  • Neutron spectroscopy — Neutron scattering is a spectroscopic method that uses neutron scattering to measure atomic and magnetic motions of atoms. Inelastic neutron scattering observes the change in the energy of the neutron as it scatters from a sample and can be used… …   Wikipedia

  • Neutron spin echo — Science with Neutrons Foundations Neutron temperature Flux · Radiation  …   Wikipedia

  • Neutron diffraction — Science with Neutrons Foundations Neutron temperature Flux · Radiation  …   Wikipedia

  • Neutron — This article is about the subatomic particle. For other uses, see Neutron (disambiguation). Neutron The quark structure of the neutron. (The color assignment of individual quarks is not important, only that all three colors are present.)… …   Wikipedia

  • Neutron triple-axis spectrometry — Triple axis redirects here. For the concept in rocketry, see Three axis stabilisation. Science with Neutrons Foundations Neutron temperature …   Wikipedia

  • Neutron time-of-flight scattering — Science with Neutrons Foundations Neutron temperature Flux · Radiation  …   Wikipedia

  • Neutron backscattering — Science with Neutrons Foundations Neutron temperature Flux · Radiation  …   Wikipedia

  • Neutron cross section — Science with Neutrons Foundations Neutron temperature Flux · Radiation  …   Wikipedia