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Excited state dynamics of β-carotene explored with dispersed multi-pulse transient absorption

Larsen, Delmar S. ; Papagiannakis, Emmanouil ; van Stokkum, Ivo H.M. ; Vengris, Mikas ; Kennis, John T.M. ; van Grondelle, Rienk

Chemical physics letters, 2003-11, Vol.381 (5), p.733-742 [Periódico revisado por pares]

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Título:
Excited state dynamics of β-carotene explored with dispersed multi-pulse transient absorption
Autor: Larsen, Delmar S. ; Papagiannakis, Emmanouil ; van Stokkum, Ivo H.M. ; Vengris, Mikas ; Kennis, John T.M. ; van Grondelle, Rienk
Assuntos: Atomic and molecular physics ; Exact sciences and technology ; Intensities and shapes of molecular spectral lines and bands ; Molecular properties and interactions with photons ; Molecular spectra ; Oscillator and band strengths, lifetimes, transition moments, and franck-condon factors ; Physics
É parte de: Chemical physics letters, 2003-11, Vol.381 (5), p.733-742
Descrição: The excited-state dynamics of β-carotene in hexane was studied with dispersed ultrafast transient absorption techniques. A new excited state is produced after blue-edge excitation. Pump–repump–probe and pump–dump–probe measurements identified and characterized this state, termed S ‡ , which exhibits a blue-shifted spectrum with a longer lifetime than S 1. We establish the independent co-existence of the S ‡ and S 1 states following the relaxation of S 2 and demonstrate that S ‡ is an electronically excited state and not a vibrationally excited ground-state species. Our data support the premise that S ‡ is formed directly from S 2 and not via preferential excitation of ground-state sub-populations.
Editor: Amsterdam: Elsevier B.V
Idioma: Inglês

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