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NEUTRON DIFFRACTION [2 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 2003-11-21

English

Subject field(s)
  • Atomic Physics
  • Industrial Techniques and Processes
  • Chemistry
DEF

An analytical technique analogous to x-ray diffraction in which an incident beam of neutrons is scattered by the atoms of a crystal.

CONT

Because elements that are close to each other in the Periodic Table differ considerably in their neutron-scattering ability, neutron diffraction is capable of distinguishing between them. For example, carbon nitrogen, and oxygen atoms can be readily identified by neutron diffraction, where as they appear almost identical by the x-ray method. More accurate determination of the bond lengths of light atoms and distribution of molecular bonding electrons is also possible. Details of molecular structure that can only be inferred by other techniques can often be observed directly by neutron diffraction. Investigations using this method include hydrogen bonding, so-called metal cluster compounds (C.H.M relationships) and electronic charge distributions.

French

Domaine(s)
  • Physique atomique
  • Techniques industrielles
  • Chimie
CONT

En réalité la seule méthode capable de déceler la structure atomique de la plupart des macromolécules est la diffraction des rayons X par des cristaux. [...] La diffraction neutronique est surtout utilisée pour placer les atomes d'hydrogène, trop légers pour être normalement détectés par diffraction des rayons X, dans des modèles atomiques obtenus par cette dernière méthode.

Spanish

Campo(s) temático(s)
  • Física atómica
  • Procesos y técnicas industriales
  • Química
DEF

Difracción de los neutrones térmicos que por tener una longitud de onda asociada aproximadamente igual a la distancia entre los átomos de los cristales, son difractados por éstos.

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Record 2 1993-05-18

English

Subject field(s)
  • Organizations, Administrative Units and Committees
OBS

IUCr : International Union of Crystallography

Key term(s)
  • Commission on Neutron Diffraction

French

Domaine(s)
  • Organismes, unités administratives et comités

Spanish

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