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'''Gas electron diffraction''' (GED) is one of the applications of [[electron diffraction]] techniques.<ref name=":0">{{Cite book|last=Rankin, David W. H.|title=Structural methods in molecular inorganic chemistry|others=Morrison, Carole A., 1972-, Mitzel, Norbert W., 1966-|date=2 January 2013|isbn=978-1-118-46288-1|___location=Chichester, West Sussex, United Kingdom|oclc=810442747}}</ref> The target of this method is the determination of the structure of [[gaseous molecules]], i.e., the [[Molecular geometry|geometrical arrangement of the atoms]] from which a molecule is built up. GED is one of two experimental methods (besides microwave spectroscopy) to determine the structure of free molecules, undistorted by intermolecular forces, which are omnipresent in the solid and liquid state. The determination of accurate molecular structures<ref>{{Cite book|title=Accurate molecular structures : their determination and importance|date=1992|publisher=International Union of Crystallography|others=Domenicano, Aldo., Hargittai, István.|isbn=0-19-855556-3|___location=[Chester, England]|oclc=26264763}}</ref> by GED studies is fundamental for an understanding of [[structural chemistry]].<ref>{{Cite book|last=Wells, A. F. (Alexander Frank), 1912-|title=Structural inorganic chemistry|date=12 July 2012|isbn=978-0-19-965763-6|edition=Fifth|___location=Oxford|oclc=801026482}}</ref><ref name=":0" />
== Introduction ==
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