X-ray natural circular dichroism and chiral-EXAFS in gyrotropic crystals

X-ray natural circular dichroism and chiral-EXAFS in gyrotropic crystals

X‐ray natural circular dichroism (XNCD) has been recently detected in the XANES region for uniaxial and biaxial gyrotropic crystals. Chiral‐EXAFS (χ‐EXAFS) spectra are reported for the first time over a wider energy range and are analysed in terms of multiple‐scattering paths of relevant symmetry. F...

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Veröffentlicht in:Journal of synchrotron radiation 2000-05, Vol.7 (3), p.182-188
Hauptverfasser: Goulon, José, Goulon-Ginet, Chantal, Rogalev, Andrei, Benayoun, Gisèle, Brouder, Christian, Natoli, Calogero R.
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Sprache:eng
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gyrotropy
optical activity
XNCD
χ-EXAFS
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container_end_page 188
container_issue 3
container_start_page 182
container_title Journal of synchrotron radiation
container_volume 7
creator Goulon, José
Goulon-Ginet, Chantal
Rogalev, Andrei
Benayoun, Gisèle
Brouder, Christian
Natoli, Calogero R.
description X‐ray natural circular dichroism (XNCD) has been recently detected in the XANES region for uniaxial and biaxial gyrotropic crystals. Chiral‐EXAFS (χ‐EXAFS) spectra are reported for the first time over a wider energy range and are analysed in terms of multiple‐scattering paths of relevant symmetry. For such heavily absorbing single crystals as lithium iodate, paratellurite or potassium titanyl phosphate, the differential absorption between left‐handed and right‐handed circularly polarized X‐ray photons cannot be measured in transmission but gyrotropy effects can still be detected in fluorescence excitation spectra. Whereas XNCD and fluorescence‐detected X‐ray natural circular dichroism spectra are strictly identical for uniaxial crystals, it has been established that this was true only to the first order for biaxial crystals such as potassium titanyl phosphate.
doi_str_mv 10.1107/S0909049500003009
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subjects gyrotropy
optical activity
XNCD
χ-EXAFS
title X-ray natural circular dichroism and chiral-EXAFS in gyrotropic crystals
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