Gas electron diffraction: Difference between revisions

Revision as of 10:16, 20 December 2018

Revision as of 00:25, 29 December 2018

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The total scattering intensity in GED is given as a [[function (mathematics)|function]] of the [[momentum]] transfer, which is defined as the difference between the [[wave vector]] of the incident [[electron]] beam and that of the scattered electron beam and has the [[reciprocal dimension]] of [[length]]. The total scattering intensity is composed of two parts: the [[atomic scattering intensity]] and [[the molecular scattering intensity]]. The former decreases [[monotonically]] and contains no information about the molecular structure. The latter has [[sinusoidal]] modulations as a result of the [[Interference (wave propagation)|interference]] of the scattering [[spherical waves]] generated by the scattering from the atoms included in the target molecule. The interferences reflect the distributions of the atoms composing the molecules, so the molecular structure is determined from this part.

{{DEFAULTSORT:Gas Electron Diffraction}}

[[Category:Diffraction]]

'''Theory'''<ref>{{Cite book|title=Stereochemical Applications of Gas‐Phase Electron Diffraction, Part A: The Electron Diffraction Technique|last=Hargittai|first=I.|publisher=VCH Verlagsgesellschaft|year=1988|isbn=3‐527‐26691‐7/0‐89573‐337‐4|___location=Weinheim|pages=}}</ref>

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So it is the molecular scattering intensity that is of interest, and this is obtained by calculation all other contributions and subtracting them from the experimentally measured total scattering function.

==References==

{{reflist}}

{{DEFAULTSORT:Gas Electron Diffraction}}

[[Category:Diffraction]]