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Science 21 July 1978:
Vol. 201. no. 4352, pp. 257 - 259
DOI: 10.1126/science.201.4352.257
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Articles

LIII-Edge Anomalous X-ray Scattering by Cesium Measured with Synchrotron Radiation

JAMES C. PHILLIPS 1, DAVID H. TEMPLETON 2, LIESELOTTE K. TEMPLETON 2, and KEITH O. HODGSON 3

1 Department of Chemistry, Stanford University, Stanford, California 94305
2 Department of Chemistry and Lawrence Berkeley Laboratory, University of California, Berkeley 94720
3 Department of Chemistry, Stanford University

Diffraction of monochromatized synchrotron radiation by crystals of cesium hydrogen tartrate has been used to measure the magnitude and phase of x-ray scattering for cesium near the LIII absorption edge. In this wavelength region the scattering amplitude of cesium is reduced by as much as 25 electrons per atom, compared to scattering of copper Kagr x-rays. This change, which varies as a function of wavelength, affects the diffraction intensities in a manner similar to isomorphous substitution, and it is large enough to have promise for phase determination in the study of macromolecular structures. This experiment also demonstrates that accurate diffractometer measurements are possible with synchrotron radiation produced by an electron storage ring.

Submitted on March 1, 1978


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
New Opportunities in Synchrotron X-ray Crystallography.
C. T. PREWITT, P. COPPENS, J. C. PHILLIPS, and L. W. FINGER (1987)
Science 238, 312-319
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Science. ISSN 0036-8075 (print), 1095-9203 (online)