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Ellipsometry and absorption spectroscopies have been carried out on sexithiophene (α-6T), and quaterthiophene (α-4T) single crystals grown at High Temperature (HT) or Low Temperature (LT). Effective Optical Indices (EOI) neff and keff have been obtained in two positions of the crystals: b axis being either perpendicular to the yz incidence plane (α=0 °) or parallel to Oy (α=90 °).The spectra contain...
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