Molecular dynamics of ß-carotene in solution measured by subpicosecond transient optical Kerr effect

Anno: 1992

Autori: Foggi P., Righini R., Torre R., Kamalov V.F.

Affiliazione autori: European Laboratory for Non-Linear Spectroscopy (LENS), University of Florence, Largo E. Fermi 2, 50125 Florence, Italy; Photochemistry Department, Institute of Chemical Physics, Academy of Sciences, Kosygin Street, Moscow, 117977, Russian Federation

Abstract: Optical anisotropy was created and detected in diluted solutions of all-trans ß-carotene in n-dodecane by femtosecond pump and probe pulses. At low pump intensity the anisotropy is due to photoselection produced by one-photon absorption, and it decays with the lifetime (8 ps) of the lowest electronic excited state of ß-carotene. At high pump intensity optical Kerr effect can be detected thanks to the amplification of the solute non-linear susceptibility due to the resonance of the probe beam with the first electronic transition of ß-carotene. Besides the instantaneous electronic response, two relaxation times (250 fs and 215 ps) are observed and attributed to the dynamics of ß-carotene molecules in the ground electronic state.

Giornale/Rivista: CHEMICAL PHYSICS LETTERS

Volume: 193 (1-3)      Da Pagina: 23  A: 29

Maggiori informazioni: Consiglio Nazionale delle Ricerche, CNR. College of Natural Resources, University of California Berkeley, CNR. – for the stimulating discussions. This work was supported by the Italian Minister0 per l’universita e la Ricerca Scientifica e Tecnologica (MURST) and by the Consiglio Nazionale delle Ricerche (CNR ).
Parole chiavi: Light-scattering; Liquids
DOI: 10.1016/0009-2614(92)85677-3

Citazioni: 16
dati da “WEB OF SCIENCE” (of Thomson Reuters) aggiornati al: 2025-05-18
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