Location of the low-energystate in a polythiophene oligomer by two-photon absorption spectroscopy: α-sexithienyl
- 17 February 1992
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 68 (7), 919-922
- https://doi.org/10.1103/physrevlett.68.919
Abstract
The two-photon excitation spectrum in polycrystalline α-sexithienyl () thin films has been investigated at 4.2 K in the spectral range between 910 and 1180 nm of the fundamental laser radiation. The intense two-photon absorption band at 18 350 is assigned to the exciton band origin. The comparison of the one-photon and two-photon excitation spectra shows that the lowest ‘‘gerade’’ exciton level lies at 898 above the lowest one-photon-allowed 1 exciton level.
Keywords
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