Ultrafast Dynamics of All-trans-β-Carotene Explored by Resonant and Nonresonant Photoexcitations

D. Kosumi, M. Komukai, H. Hashimoto, M. Yoshizawa

Research output: Contribution to journalArticlepeer-review

60 Citations (Scopus)

Abstract

Excitation energy dependence of transmittance change has been investigated in β-carotene. The signal induced by nonresonant excitation is ascribed to the ac Stark effect and the two-photon absorption of the excitation and probe pulses in three-level systems. The ultrafast response following resonant excitation is assigned to the two-photon absorption and the transient absorption of the photogenerated S2(1Bu+1) state with a lifetime of 150fs. The long-debated S2-S1 relaxation in β-carotene can be explained by a two-state model (S2,S1) without involving any intermediate states.

Original languageEnglish
Article number213601
JournalPhysical Review Letters
Volume95
Issue number21
DOIs
Publication statusPublished - 2005 Nov 18

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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