Dispersion of anomalous azimuthal rotation and circular extinction contrast in dyed K2SO4 crystals

We present measurements of the dispersion of anomalous azimuthal rotation signals from dyed crystals that are at variance with our predictions based on a model of these effects predicated on the predominance of Rayleigh scattering from isolated dye molecules (Kaminsky et al. J Phys Chem A 107:2800–2...

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Bibliographic Details
Published in:Chirality (New York, N.Y.) N.Y.), 2004, Vol.16 (S1), p.S55-S61
Main Authors: Kaminsky, Werner, Herreros-Cedrés, Javier, Geday, Morten A., Kahr, Bart
Format: Article
Language:English
Subjects:
azimuthal rotation
circular extinction contrast
dispersion
dyed crystals
K2SO4
Trypan blue
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Summary:We present measurements of the dispersion of anomalous azimuthal rotation signals from dyed crystals that are at variance with our predictions based on a model of these effects predicated on the predominance of Rayleigh scattering from isolated dye molecules (Kaminsky et al. J Phys Chem A 107:2800–2807, 2003). Here, we extend our scattering model to include the effects of the absorption and refraction of individual dyes that are inclined in a biased manner with respect to the eigenmodes of the medium. Our revised model describes the wavelength dependence of the rotations. It is likely that absorption, refraction, and Rayleigh scattering are all manifest, with absorption and refraction being the leading effects. Chirality 16:S55–S61, 2004. © 2004 Wiley‐Liss, Inc.
ISSN:0899-0042
1520-636X
DOI:10.1002/chir.20054