One- and two-photon pump-probe optical spectroscopic measurements reveal the S-1 and intramolecular charge transfer states are distinct in fucoxanthin

Kosumi D; Kusumoto T; Fujii R; Sugisaki M; Iinuma Y; Oka N; Takaesu Y; Taira T; Iha M; Frank HA; Hashimoto H

Chemical Physics Letters, Vol.483, No.1-3, 95-100, 2009

DOI10.1016/j.cplett.2009.10.077 Export Citation

One- and two-photon pump-probe optical spectroscopic measurements reveal the S-1 and intramolecular charge transfer states are distinct in fucoxanthin

Kosumi D, Kusumoto T, Fujii R, Sugisaki M, Iinuma Y, Oka N, Takaesu Y, Taira T, Iha M, Frank HA, Hashimoto H

The ultrafast relaxation kinetics of fucoxanthin in polar and non-polar solvents have been studied by femtosecond dispersed one-and two-photon pump-probe spectroscopies. Transient absorption kinetics of the lowest singlet S-1 (2(1)A(g)(-)) state and/or intramolecular charge transfer (ICT) state after excitation to the optically allowed S-2 (1(1)B(u)(+)) state depend strongly on solvent polarity. Transient absorption spectra and the kinetics of absorbance changes after direct two-photon excitation to S-1/ICT depend strongly on excitation energy in non-polar solvent. The results suggest that the ICT state is a distinct state from S-1 in polar solvent. (C) 2009 Elsevier B.V. All rights reserved.