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Coherent nuclear motions in light‐harvesting pigments and dye molecules, probed by ultrafast spectroscopy
Author(s) -
Chachisvilis Mirianas,
Fidder Henk,
Pullerits TÕNu,
Sundström Villy
Publication year - 1995
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.1250260706
Subject(s) - molecule , spectroscopy , ultrashort pulse , purple bacteria , wavelength , light harvesting complex , molecular physics , chemistry , pigment , photochemistry , ultrafast laser spectroscopy , absorption (acoustics) , raman spectroscopy , chemical physics , physics , photosynthesis , optics , photosynthetic reaction centre , photosystem ii , laser , quantum mechanics , biochemistry , organic chemistry , electron transfer
The temporal evolution of the transient absorption response of light‐harvesting antennae and dye molecules was studied. Using 40—90 fs pulses coherent nuclear motions were observed in intact membrane‐bound photosynthetic light‐harvesting pigment‐protein complexes, bacteriochlorophyll α monomer and dye molecules in solutions. Computer simulations based on the harmonic Franck—Condon approximation and the Langevin equation describe qualitatively well the wavelength dependence of the oscillations of the mode when exciting and probing in the blue side of the spectrum.