Ultrafast relaxation kinetics of the dark S1 state in all-trans-β-carotene explored by one- and two-photon pump-probe spectroscopy

Daisuke Kosumi, Kenta Abe, Hiroshi Karasawa, Masazumi Fujiwara, Richard J. Cogdell, Hideki Hashimoto, Masayuki Yoshizawa

Research output: Contribution to journalArticlepeer-review

36 Citations (Scopus)

Abstract

Femtosecond one- and two-photon pump-probe dispersive spectroscopic measurements have been applied to the investigation of the vibrational relaxation kinetics of the dark S1 (21Ag-) state in β-carotene, combining a higher sensitive detection system with tunable visible and infrared excitation pulses. The two-photon excitation measurements enable the preferential detection of the dark S1 state. The tunable infrared excitation pulses allowed selective excitation to a different vibrational level of S1. The S1 dynamics at early delay times depend strongly on excitation energy. A dependence of the initial S 1 dynamics on excitation energy is discussed in term of the vibrational relaxation of S1.

Original languageEnglish
Pages (from-to)33-37
Number of pages5
JournalChemical Physics
Volume373
Issue number1-2
DOIs
Publication statusPublished - Jul 19 2010
Externally publishedYes

Keywords

  • Excited state
  • Nonlinear optics
  • Ultrafast phenomena

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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