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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{sup ′}-carotenal

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.
Authors:
; ;  [1] ; ; ;  [2] ;  [3] ;  [4] ;  [2] ;  [4] ;  [2] ;  [4] ;  [3]
  1. Department of Chemistry, University of Warsaw, Zwirki Wigury 101, 02-089 Warsaw (Poland)
  2. European Laboratory for Non-linear Spectroscopy (LENS), Universita di Firenze, Via Nello Carrara 1, I-50019 Sesto Fiorentino (Italy)
  3. (Italy)
  4. (Istituto Nazionale di Ottica), Largo Fermi 6, 50125 Firenze (Italy)
Publication Date:
OSTI Identifier:
22304331
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Chemical Physics; Journal Volume: 140; Journal Issue: 20; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; 37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; 77 NANOSCIENCE AND NANOTECHNOLOGY; ELECTRONIC STRUCTURE; GROUND STATES; PROJECTION OPERATORS; RAMAN EFFECT; SPECTRA; TIME RESOLUTION; TRANSIENTS