Directional dispersion in absorbance spectra of oligothiophene crystals

Spearman, P., Borghesi, A., Campione, M., Laicini, M., Moret, M. and Tavazzi, S. (2005) Directional dispersion in absorbance spectra of oligothiophene crystals. The Journal of Chemical Physics, 122(1), ISSN (print) 0021-9606

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Due to the large oscillator strength of the first molecular transition in oligothiophenes, a strong directional dispersion of the b(u) exciton transition is expected originating from the macroscopic polarization field. Examining such dispersion unambiguously usually requires different faces to be accessible for the optical measurements. Alternatively, measurements carried out at different angles of incidence are met with intrinsic limits due to the peculiarities of wave propagation in such anisotropic systems. In order to demonstrate these limits along with the experimental difficulties involved, we examine refraction and absorption of light in these crystals and discuss the effects of directional dispersion on the absorbance spectra of quaterthiophene crystals.

Item Type: Article
Additional Information: Article no: 014706.
Uncontrolled Keywords: alpha-oligothiophenes, quaterthiophene
Research Area: Metallurgy and materials
Faculty, School or Research Centre: Faculty of Science (until 2011) > School of Pharmacy and Chemistry
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Depositing User: Ban Talal
Date Deposited: 19 Mar 2007
Last Modified: 20 Jan 2012 14:18

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