Author/Authors :
Kosumi، نويسنده , , Daisuke and Kusumoto، نويسنده , , Toshiyuki and Fujii، نويسنده , , Ritsuko and Sugisaki، نويسنده , , Mitsuru and Iinuma، نويسنده , , Yoshiro and Oka، نويسنده , , Naohiro and Takaesu، نويسنده , , Yuki and Taira، نويسنده , , Tomonori and Iha، نويسنده , , Masahiko and Frank، نويسنده , , Harry A. and Hashimoto، نويسنده , , Hideki، نويسنده ,
Abstract :
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 S1 (21 A g - ) state and/or intramolecular charge transfer (ICT) state after excitation to the optically allowed S2 ( 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 S1/ICT depend strongly on excitation energy in non-polar solvent. The results suggest that the ICT state is a distinct state from S1 in polar solvent.
