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"Vibrational Coherence in Photosynthetic Reaction Centers Observed in the Bacteriochlorophyll Anion Band" S. Spörlein, W. Zinth, J. WachtveitlJ. Phys. Chem. B102 (1998) 7492-7496 Abstract: Oscillatory components of the absorption changes in reaction centers from Rhodobacter sphaeroides are observed by femtosecond spectroscopy inthe spectral region between 920 nm and 1100 nm covering the ranges of excited state absorption and stimulated emission of the photoexcited primarydonor and the long wavelength absorption band of the bacteriochlorophyll anion. These oscillations with a dominant frequency of 135 cm-1 are dampedon the 0.4 - 0.8 ps time scale. The observations fit well into a model with vibrational wavepacket motion on the excited state potential surfacemodulating stimulated emission. Amplitudes and phases of the oscillation do not show any peculiarity within the absorption band of thebacteriochlorophyll anion indicating that the interaction of this wavepacket with electron transfer to the accessory bacteriochlorophyll is not required toexplain the experimental data. BMO authors (in alphabetic order): Sebastian Spörlein Josef Wachtveitl Wolfgang Zinth |