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Proceedings Paper

X-ray natural circular dichroism (XNCD) in gyrotropic crystals
Author(s): Jose Goulon; Chantal Goulon-Ginet; Andrei Rogalev; Gisele Benayoun; Cecile Malgrange; Christian Brouder
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Paper Abstract

We have produced recently the very first experimental evidence that X-ray Natural Circular Dichroism (XNCD) can be detected in both uniaxial and biaxial gyrotropic single crystals. XNCD signals are to be assigned to electric dipole-electric quadrupole E1.E2 interference terms which can be quite significant in the X-ray range whereas there can hardly be any detectable contribution of the electric dipole-magnetic dipole E1.M1 terms which dominate CD at optical wavelengths. For heavily absorbing single crystals, the differential absorption between left-handed and right-handed circularly polarized X- ray photons cannot be measured in transmission but circular dichroism can still be detected in fluorescence excitation spectra. XNCD and Fluorescence detected X-ray Natural Circular Dichroism (Fd-XNCD) spectra are strictly identical for uniaxial crystals such a lithium iodate ((alpha) -LiIO3) but this is only true to the first order for biaxial crystals such as potassium titanyl phosphate (KTP). Such difficult experiments became feasible only with the development of powerful helical undulator sources and with a careful optimization of all components of the beamline.

Paper Details

Date Published: 16 November 1999
PDF: 10 pages
Proc. SPIE 3773, X-Ray Optics Design, Performance, and Applications, (16 November 1999); doi: 10.1117/12.370104
Show Author Affiliations
Jose Goulon, European Synchrotron Radiation Facility (France)
Chantal Goulon-Ginet, European Synchrotron Radiation Facility and Univ. Joseph Fourier (France)
Andrei Rogalev, European Synchrotron Radiation Facility (France)
Gisele Benayoun, European Synchrotron Radiation Facility (France)
Cecile Malgrange, Univ. de Paris VI and Univ. de Paris VII (France)
Christian Brouder, Univ. de Paris VI and Univ. de Paris VII (France)

Published in SPIE Proceedings Vol. 3773:
X-Ray Optics Design, Performance, and Applications
Ali M. Khounsary; Andreas K. Freund; Tetsuya Ishikawa; George Srajer; Jonathan C. Lang, Editor(s)

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