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Dispersion of anomalous azimuthal rotation and circular extinction contrast in dyed K 2 SO 4 crystals
Author(s) -
Kaminsky Werner,
HerrerosCedrés Javier,
Geday Morten A.,
Kahr Bart
Publication year - 2004
Publication title -
chirality
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.43
H-Index - 77
eISSN - 1520-636X
pISSN - 0899-0042
DOI - 10.1002/chir.20054
Subject(s) - chemistry , rotation (mathematics) , extinction (optical mineralogy) , dispersion (optics) , contrast (vision) , azimuth , spatial dispersion , optics , molecular physics , geometry , mineralogy , physics , mathematics
Abstract 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.