Directional dispersion of exciton levels in alpha-oligothiophenes

Authors
Spearman, P Kouki, F Lang, P Valat, P Horowitz, G Garnier, F
Citation
P. Spearman et al., Directional dispersion of exciton levels in alpha-oligothiophenes, SYNTH METAL, 119(1-3), 2001, pp. 589-590
Citations number
8
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
SYNTHETIC METALS
ISSN journal
03796779 → ACNP
Volume
119
Issue
1-3
Year of publication
2001
Pages
589 - 590
Database
ISI
SICI code
0379-6779(20010315)119:1-3<589:DDOELI>2.0.ZU;2-6
Abstract
Angle dependence of the upper Davydov transition of alpha -quinquethiophene (5T) is presented in terms of macroscopic dielectric theory. Optical const ants are derived from ellipsometry measurements and used in the model to an alyse the directional dispersion of excitons with incidence angle. The obse rved transition around 3.6 eV lies between the frequencies corresponding to the transverse optic (TO) at 3.35 eV and longitudinal optic (LO) mode at 3 .8 eV.