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Journal ArticleDOI

Low-temperature X-ray system for materials of high chemical reactivity, high vapor pressure, or low melting point

01 Dec 1973-Journal of Applied Crystallography (International Union of Crystallography)-Vol. 6, Iss: 6, pp 437-441
TL;DR: In this paper, a system for growing single crystals and making X-ray diffraction measurements by both photographic and counter means at low temperatures over extended periods of time is described, and the system is shown to work well in both indoor and outdoor environments.
Abstract: A system for growing single crystals and making X-ray diffraction measurements by both photographic and counter means at low temperatures over extended periods of time is described.
Citations
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Journal ArticleDOI
TL;DR: In this paper, a new type of thermostatic attachment to standard diffractometers allowing operations both above and below room temperature (-150 to +900 degrees C) and under vacuum is described.
Abstract: A new type of thermostatic attachment to standard diffractometers allowing operations both above and below room temperature (-150 to +900 degrees C) and under vacuum is described. It has proved to be very useful in studying chemical reactivity and phase transitions owing to its simple assembly and great flexibility. The thermal expansion of sodium chloride is reported to illustrate the obtainable accuracy.

14 citations

Journal ArticleDOI
TL;DR: The Inter-Congress Conference on Anomalous Scattering as mentioned in this paper was held 22-26 April 1974 in Madrid, Spain for the purpose of stimulating new and current use of anomalous scattering and for improving the present theoretical and experimental approaches to the interpretation and measurement of anomaly.
Abstract: s of Papers for the Madrid Conference on Anomalous Scattering The Inter-Congress Conference on Anomalous Scattering, organized by the Commission on Crystallographic Apparatus, was held 22-26 April 1974 in Madrid, Spain for the purpose of stimulating new and current use of anomalous scattering and for improving the present theoretical and experimental approaches to the interpretation and measurement of anomalous scattering. Invited papers were presented in the following sessions: 1. Theoretical calculation of dispersion corrections. 2. Experimental determination of dispersion corrections. 3. Absolute intensity measurement including anomalous scattering. 4. Effects of dispersion on atomic parameters. 5. Use of anomalous scattering in protein structure analysis. 7. Absolute configuration and tensorial properties. 8. Novel methods for using anomalous scattering. Abstracts of 35 papers have been printed and are available, price £ 1 postaid, from the Executive Secretary International Union of Crystallography, 13 White Friars, Chester CH 1 1 NZ, England. The proceedings of the Conference will be published in book form at a date to be announced later.

3 citations

Journal ArticleDOI
TL;DR: In this paper, a single-stage closed-cycle helium gas cryogenerator, capable of cooling between 77 K and 300 K, has been installed on the 4-circle neutron diffractometer at CIRUS.
Abstract: A single-stage closed-cycle helium gas cryogenerator, capable of cooling between 77 K and 300 K, has been installed on the 4-circle neutron diffractometer at CIRUS. The cryo-tip assembly has been incorporated directly on the ϕ-circle of the full-circle crystal orienter in place of the goniometer head used in room temperature experiments. The salient features of this low-temperature attachment and its performance are discussed.

1 citations

Journal ArticleDOI
TL;DR: In this paper, the lattice-parameter error due to a relative misorientation between the specimen and the flat film in the transmission divergent X-ray beam and Kossel techniques developed for alpha -iron has been studied in detail.
Abstract: The lattice-parameter error due to a relative misorientation between the specimen and the flat film in the transmission divergent X-ray beam and Kossel techniques developed for alpha -iron has been studied in detail. It has been shown that the most frequently encountered case of film misorientation can be theoretically divided into two pure components. The Type I component has been shown to have no influence whatsoever on the lattice parameter measured by this or any other method involving the ratio technique. The lattice-parameter error is thus due exclusively to the Type II component. In addition, it has been shown that these errors, which can become relatively important, are present in all linearly non-symmetric methods. In contrast, errors due to Type II components in linearly symmetrical methods should be very small if not experimentally undetectable. The geometry involved is such that the lattice parameter error cannot be experimentally determined. However, such film misorientations and their resulting lattice-parameter errors can be reduced to a very low value by means of the reticule method previously proposed and described.
References
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Journal ArticleDOI
TL;DR: The Inter-Congress Conference on Anomalous Scattering as mentioned in this paper was held 22-26 April 1974 in Madrid, Spain for the purpose of stimulating new and current use of anomalous scattering and for improving the present theoretical and experimental approaches to the interpretation and measurement of anomaly.
Abstract: s of Papers for the Madrid Conference on Anomalous Scattering The Inter-Congress Conference on Anomalous Scattering, organized by the Commission on Crystallographic Apparatus, was held 22-26 April 1974 in Madrid, Spain for the purpose of stimulating new and current use of anomalous scattering and for improving the present theoretical and experimental approaches to the interpretation and measurement of anomalous scattering. Invited papers were presented in the following sessions: 1. Theoretical calculation of dispersion corrections. 2. Experimental determination of dispersion corrections. 3. Absolute intensity measurement including anomalous scattering. 4. Effects of dispersion on atomic parameters. 5. Use of anomalous scattering in protein structure analysis. 7. Absolute configuration and tensorial properties. 8. Novel methods for using anomalous scattering. Abstracts of 35 papers have been printed and are available, price £ 1 postaid, from the Executive Secretary International Union of Crystallography, 13 White Friars, Chester CH 1 1 NZ, England. The proceedings of the Conference will be published in book form at a date to be announced later.

3 citations