Optical anisotropy was created and detected in diluted solutions of all-trans beta-carotene in n-dodecane by femtosecond pump and probe pulses. At low pump intensity the anisotropy is due to photoselection produced by one-photon absorption, and it decays with the lifetime (8 ps) of the lowest electronic excited state of beta-carotene. At high pump intensity optical Kerr effect can be detected thanks to the amplification of the solute non-linear susceptibility due to the resonance of the probe beam with the first electronic transition of beta-carotene. Besides the instantaneous electronic response, two relaxation times (250 fs and 215 ps) are observed and attributed to the dynamics of beta-carotene molecules in the ground electronic state.
Molecular dynamics of [beta]-carotene in solution measured by subpicosecond transient optical Kerr effect / P. Foggi; R. Righini; R. Torre; V.F. Kamalov. - In: CHEMICAL PHYSICS LETTERS. - ISSN 0009-2614. - STAMPA. - 193:(1992), pp. 23-29. [10.1016/0009-2614(92)85677-3]
Molecular dynamics of [beta]-carotene in solution measured by subpicosecond transient optical Kerr effect
RIGHINI, ROBERTO;TORRE, RENATO;
1992
Abstract
Optical anisotropy was created and detected in diluted solutions of all-trans beta-carotene in n-dodecane by femtosecond pump and probe pulses. At low pump intensity the anisotropy is due to photoselection produced by one-photon absorption, and it decays with the lifetime (8 ps) of the lowest electronic excited state of beta-carotene. At high pump intensity optical Kerr effect can be detected thanks to the amplification of the solute non-linear susceptibility due to the resonance of the probe beam with the first electronic transition of beta-carotene. Besides the instantaneous electronic response, two relaxation times (250 fs and 215 ps) are observed and attributed to the dynamics of beta-carotene molecules in the ground electronic state.File | Dimensione | Formato | |
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