title: 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.
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.
authors.affiliation: Department of Chemistry, University of Warsaw, Zwirki Wigury 101, 02-089 Warsaw, Poland.
authors.forename: T M
authors.initials: TM
authors.lastname: Kardaś
authors.affiliation: Department of Chemistry, University of Warsaw, Zwirki Wigury 101, 02-089 Warsaw, Poland.
authors.forename: B
authors.initials: B
authors.lastname: Ratajska-Gadomska
authors.affiliation: European Laboratory for Non-linear Spectroscopy (LENS), Universit`a di Firenze, Via Nello Carrara 1, I-50019 Sesto Fiorentino (FI), Italy.
authors.forename: A
authors.initials: A
authors.lastname: Lapini
authors.affiliation: European Laboratory for Non-linear Spectroscopy (LENS), Universit`a di Firenze, Via Nello Carrara 1, I-50019 Sesto Fiorentino (FI), Italy.
authors.forename: E
authors.initials: E
authors.lastname: Ragnoni
authors.affiliation: European Laboratory for Non-linear Spectroscopy (LENS), Universit`a di Firenze, Via Nello Carrara 1, I-50019 Sesto Fiorentino (FI), Italy.
authors.forename: R
authors.initials: R
authors.lastname: Righini
authors.affiliation: European Laboratory for Non-linear Spectroscopy (LENS), Universit`a di Firenze, Via Nello Carrara 1, I-50019 Sesto Fiorentino (FI), Italy.
authors.forename: M
authors.initials: M
authors.lastname: Di Donato
authors.affiliation: European Laboratory for Non-linear Spectroscopy (LENS), Universit`a di Firenze, Via Nello Carrara 1, I-50019 Sesto Fiorentino (FI), Italy.
authors.forename: P
authors.initials: P
authors.lastname: Foggi
authors.affiliation: Department of Chemistry, University of Warsaw, Zwirki Wigury 101, 02-089 Warsaw, Poland.
authors.forename: W
authors.initials: W
authors.lastname: Gadomski