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• W2086121354 abstract "Femtosecond time-resolved pump-degenerate four-wave mixing (pump-DFWM) spectroscopy has been used to study the ultrafast dynamics of β-carotene involving several electronic and vibrational states. An initial pump pulse, resonant with the S0-to-S2 transition, excites the molecular system and a DFWM process, resonant with the S1-to-Sn transition, is used to probe the relaxation pathways. The transient shows a peculiar decay behavior, which is due to the contributions of resonant DFWM signal of the excited S1 state, nonresonant DFWM signal of the ground S0 state and vibrational hot S0∗ state, and the two-photon resonant DFWM signal of the ground S0 state. We have used a kinetic model including all the signal contributions to successfully fit the transient. The time constants extracted are in very good agreement with the known values for β-carotene. For comparison, a two-pulse pump-probe experiment was performed measuring the transient absorption at the wavelength of the DFWM experiment." @default.
• W2086121354 created "2016-06-24" @default.
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• W2086121354 date "2010-08-03" @default.
• W2086121354 modified "2023-10-17" @default.
• W2086121354 title "Two-photon resonances in femtosecond time-resolved four-wave mixing spectroscopy: β-carotene" @default.
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• W2086121354 doi "https://doi.org/10.1063/1.3466750" @default.
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