Abstract
Ultrafast optical phenomena in all-trans-β-carotene have been investigated by femtosecond absorption and fluorescence spectroscopy. Following a resonant pump pulse, both fluorescence and absorbance changes have a decay time of 150 fs. The signals are assigned to the lowest optically allowed singlet excited state, 11 B +u . Transmittance changes induced by nonresonant pump pulses depend on the pump photon energy. They are interpreted in terms of the ac Stark effect in three-level systems and two-photon absorption of the pump and probe pulses generating a high-lying n 1 A −g state.
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Yoshizawa, M., Kosumi, D., Komukai, M. et al. Ultrafast optical responses of three-level systems in β-carotene: Resonance to a high-lying n 1 A − g excited state. Laser Phys. 16, 325–330 (2006). https://doi.org/10.1134/S1054660X06020204
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DOI: https://doi.org/10.1134/S1054660X06020204