X-Ray Natural Circular Dichroism
1998; American Physical Society; Volume: 80; Issue: 21 Linguagem: Inglês
10.1103/physrevlett.80.4799
ISSN1092-0145
AutoresLucilla Alagna, T. Prosperi, S. Turchini, J. Goulon, А. Рогалев, Chantal Goulon‐Ginet, C. R. Natoli, Robert D. Peacock, Brian Stewart,
Tópico(s)Electron Spin Resonance Studies
ResumoWe report the first observation of natural circular dichroism (CD) in the x-ray region. Measurements at the Nd ${L}_{3}$ edge in single crystals of ${\mathrm{Na}}_{3}\mathrm{Nd}(\mathrm{digly}{)}_{3}\ifmmode \dot{}\else \.{}\fi{}2{\mathrm{NaBF}}_{4}\ifmmode \dot{}\else \.{}\fi{}6{\mathrm{H}}_{2}\mathrm{O}$ show CD with a dissymmetry factor $g\ensuremath{\approx}{10}^{\ensuremath{-}3}$ of the same order of magnitude as observed in the visible-uv region and $\ensuremath{\sim}100$ 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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