On the Calculation of an X-Ray Natural Circular Dichroism Signal |
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| Authors: | A P Oreshko E N Ovchinnikova K A Kozlovskaya V E Dmitrienko |
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| Institution: | 1.Department of Physics,Moscow State University,Moscow,Russia;2.Crystallography and Photonics Federal Research Center, Shubnikov Institute of Crystallography,Russian Academy of Sciences,Moscow,Russia |
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| Abstract: | The sequential derivation of an expression that describes an X-ray natural circular dichroism (XNCD) signal in the most general case is performed. The obtained expression is used as a basis to consider XNCD signals and their structural origins in copper metaborate CuB2O4 crystals at an incident radiation energy near the K absorption edge of copper and lanthanum–gallium silicate La3Ga5SiO14 crystals at an incident radiation energy near the K absorption edge of gallium. It has been demonstrated that the measurements of circularly polarized X-ray absorption spectra in combination with corresponding first-principle calculations provide an efficient method for studying the contributions of crystallographically non-equivalent atoms to the X-ray optical activity of crystals. |
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