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Requirements for x-ray magnetic circular dichroism on paramagnetic biological systems and model compounds
We have built an end station for x-ray magnetic circular dichroism (XMCD) measurements on proteins and paramagnetic compounds. Our current setup reaches a base temperature of 2.6 K and magnetic fields...

Solving the crystallographic phase problem with reference-beam diffraction

Rev. Sci. Instrum. 73, 1646 (2002); doi:10.1063/1.1445828

Issue Date: March 2002

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Qun Shen, Daniel Pringle, Marian Szebenyi, and Jun Wang
Cornell High Energy Synchrotron Source (CHESS), Wilson Laboratory, Cornell University, Ithaca, New York 14853
By using a reference-beam diffraction data-collection technique, it is possible to directly measure a large number of relative phases of Bragg reflections on an area detector in a typical protein crystallography experiment. The technique, being developed at Cornell, incorporates the principle of three-beam diffraction into the most common method of data collection, i.e., the oscillating-crystal method, and allows recordings of many phase-sensitive three-beam interference profiles simultaneously. Recent advances include a dedicated five-circle kappa diffractometer and new data acquisition and analysis algorithms. Experimental results on a protein crystal are presented and the strategies of using the measured phases for solving crystal structures are discussed. ©2002 American Institute of Physics.
History: Presented 24 August 2001
Permalink: http://link.aip.org/link/?RSINAK/73/1646/1
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KEYWORDS and PACS

Keywords
PACS
  • 61.10.Nz
    Structure of solids and liquids; crystallography X-ray diffraction and scattering Single-crystal and powder diffraction
  • 61.66.Hq
    Structure of solids and liquids; crystallography Structure of specific crystalline solids Organic compounds
  • 07.85.Jy
    Instruments, apparatus, and components common to several branches of physics and astronomy X- and gamma-ray instruments Diffractometers
  • YEAR: 2002

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ISSN:
0034-6748 (print)   1089-7623 (online)
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REFERENCES (20)
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