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Identification of enantiomorphously related space groups by electron diffraction

Identification of enantiomorphously related space groups by electron diffraction A simple procedure is presented for the identification of enantiomorphous space groups by electron diffraction. This is based on the ability to determine the sense of an asymmetry in a projection, which is a property of N-beam dynamic diffraction. The steps in this procedure follow those of the X-ray procedure which depends upon anomalous dispersion instead of dynamic scattering. To illustrate and test the electron-diffraction procedure, a space-group determination was carried out on a sample of dextrorotatory -quartz: space group P3221 was found, in agreement with the findings of de Vries Nature, Lond. (1958), 181, 1193. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Acta Crystallographica Section A: Crystal Physics, Diffraction, Theoretical and General Crystallography International Union of Crystallography

Identification of enantiomorphously related space groups by electron diffraction

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Identification of enantiomorphously related space groups by electron diffraction

Goodman, P; Secomb, T.W
Acta Crystallographica Section A: Crystal Physics, Diffraction, Theoretical and General Crystallography , Volume 33 (1): 126 – Jan 1, 1977

Abstract

A simple procedure is presented for the identification of enantiomorphous space groups by electron diffraction. This is based on the ability to determine the sense of an asymmetry in a projection, which is a property of N-beam dynamic diffraction. The steps in this procedure follow those of the X-ray procedure which depends upon anomalous dispersion instead of dynamic scattering. To illustrate and test the electron-diffraction procedure, a space-group determination was carried out on a sample of dextrorotatory -quartz: space group P3221 was found, in agreement with the findings of de Vries Nature, Lond. (1958), 181, 1193.

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References (1)

Publisher
International Union of Crystallography
Copyright
Copyright (c) 1977 International Union of Crystallography
ISSN
0567-7394
DOI
10.1107/S0567739477000266
Publisher site
See Article on Publisher Site

Abstract

A simple procedure is presented for the identification of enantiomorphous space groups by electron diffraction. This is based on the ability to determine the sense of an asymmetry in a projection, which is a property of N-beam dynamic diffraction. The steps in this procedure follow those of the X-ray procedure which depends upon anomalous dispersion instead of dynamic scattering. To illustrate and test the electron-diffraction procedure, a space-group determination was carried out on a sample of dextrorotatory -quartz: space group P3221 was found, in agreement with the findings of de Vries Nature, Lond. (1958), 181, 1193.

Journal

Acta Crystallographica Section A: Crystal Physics, Diffraction, Theoretical and General Crystallography – International Union of Crystallography

Published: Jan 1, 1977

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