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.

doi:10.1063/1.4879060

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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.

Titolo:	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
Autori:	T. M. Kardaś (Corresponding) B. Ratajska-Gadomska LAPINI, ANDREA E. Ragnoni R. Righini M. Di Donato P. Foggi W. Gadomski mostra contributor esterni nascondi contributor esterni
Data di pubblicazione:	2014
Rivista:	THE JOURNAL OF CHEMICAL PHYSICS
Abstract:	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.
Handle:	http://hdl.handle.net/11696/58671
Appare nelle tipologie:	1.1 Articolo in rivista

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