We report the first observation of natural circular dichroism (CD) in the x-ray region. Measurements at the Nd L₃ edge in single crystals of Na₃Nd(digly)₃ ̇ \.2NaBF₄ ̇ \.6H₂O show CD with a dissymmetry factor g≈10^-3 of the same order of magnitude as observed in the visible-uv region and ~100 times greater than in the vibrational infrared. Calculations using multiple scattering theory (MST) are in excellent agreement with the measured CD in the near-edge region (about 100 eV from the rising edge) and show that the effect arises from the electric dipole-electric quadrupole interference mechanism.
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Alagna et al. (1998) studied this question.
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