Frontiers in Crystallography with Synchrotron Radiation. Utilizing of Various Properties of Synchrotron Radiation. Observation of Electron-Density Distributions in Transition-Metal Compounds.

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  • 放射光Ｘ線結晶学で今何ができるか？　微少量・高精度・極限に迫る　遷移金属化合物の電子密度をみる
  • センイ キンゾク カゴウブツ ノ デンシ ミツド オ ミル

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Abstract

The X-ray diffraction has a long histry of being used for observation of electron-density distributions in crystalline substances. However, the accuracy of resulting densities remains still unsatisfactory except the special cases where the Pendellösung fringe method has been applied. In the process to derive accurate structure factors, the Fourier coefficients of electron-density distributions, from integrated intensities, the extinction effects act as the largest impediments. In order to avoid the extinction effects, it is suggested to use very short wavelength radiations and/or very small specimens in the intensity collections. Synchrotron radiations with high energy and high brilliance have possibility to realize such measurements. The present review describes outlines of studies carried out along this line employing synchrotron radiations.

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