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 inversion of population on the example of optically excited trans-b-apo-8'-carotenal / Kardàs, Thomas M.; Ratajska-Gadomska, B.; Lapini, Andrea; Ragnoni, Elena; Righini, Roberto; Di Donato, Mariangela; Foggi, Paolo; Gadomski, Wojciech. - In: THE JOURNAL OF CHEMICAL PHYSICS. - ISSN 0021-9606. - 140(2014), pp. 204312-I-204312. [10.1063/1.4879060]
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