We have studied the effect of transient vibrational inversion of population in trans-β-apo-8 -carotenal on the time-resolved femtosecond stimulated Raman scattering (TR-FSRS) signal. The experimental data are interpreted by applying a quantum mechanical approach, using the formalism of projection operators for constructing the theoretical model of TR-FSRS. Within this theoretical frame we explain the presence of transient Raman losses on the Stokes side of the TR-FSRS spectrum as the effect of vibrational inversion of population. In view of the obtained experimental and theoretical results, we conclude that the excited S2 electronic level of trans-β-apo-8 -carotenal relaxes towards the S0 ground state through a set of four vibrational sublevels of S1 state.
Dynamics of the time-resolved stimulated Raman scattering spectrum in presence of transient vibronic inversion of population on the example of optically excited trans-β-apo-8′-carotenal / Kardaś, T. M.; Ratajska-Gadomska, B.; Lapini, A.; Ragnoni, E.; Righini, R.; Di Donato, M.; Foggi, P.; Gadomski, W.. - In: THE JOURNAL OF CHEMICAL PHYSICS. - ISSN 0021-9606. - 140:20(2014), p. 204312. [10.1063/1.4879060]
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