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{sup ′}-carotenal
Journal Article
·
· Journal of Chemical Physics
- Department of Chemistry, University of Warsaw, Zwirki Wigury 101, 02-089 Warsaw (Poland)
- European Laboratory for Non-linear Spectroscopy (LENS), Universita di Firenze, Via Nello Carrara 1, I-50019 Sesto Fiorentino (Italy)
We have studied the effect of transient vibrational inversion of population in trans-β-apo-8{sup ′}-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 S{sub 2} electronic level of trans-β-apo-8{sup ′}-carotenal relaxes towards the S{sub 0} ground state through a set of four vibrational sublevels of S{sub 1} state.
- OSTI ID:
- 22304331
- Journal Information:
- Journal of Chemical Physics, Journal Name: Journal of Chemical Physics Journal Issue: 20 Vol. 140; ISSN JCPSA6; ISSN 0021-9606
- Country of Publication:
- United States
- Language:
- English
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