Premium
Transient Vibronic Structure in Ultrafast Fluorescence Spectra of Photoactive Yellow Protein †
Author(s) -
Nakamura Ryosuke,
Hamada Norio,
Ichida Hideki,
Tokunaga Fumio,
Kanematsu Yasuo
Publication year - 2008
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/j.1751-1097.2008.00329.x
Subject(s) - photoexcitation , picosecond , femtosecond , excited state , excitation , ultrashort pulse , ultrafast laser spectroscopy , spectroscopy , chemistry , photochemistry , atomic physics , time resolved spectroscopy , molecular physics , fluorescence , laser , physics , optics , quantum mechanics
The ultrafast photo‐induced dynamics of wild‐type photoactive yellow protein and its site‐directed mutant of E46Q in aqueous solution was studied at room temperature by femtosecond fluorescence spectroscopy using the optical Kerr‐gate method. The vibronic structure appears, depending on the excitation photon energy, in the time‐resolved fluorescence spectra just after photoexcitation, which winds with time and disappears on a time scale of sub‐picoseconds. This result indicates that the wavepacket is localized in the electronic excited state followed by dumped oscillations and broadening, and also that the initial condition of the wavepacket prepared depending on the excitation photon energy affects much the following ultrafast dynamics in the electronic excited state.