Abstract
Oscillatory fluorescence in reaction centres of photosynthetic origin was assigned to coherent vibrational motion on the excited state potential surface by Vos and collaborators. We formalize this motion with a semiclassical wave packet consisting of several (intraprotein) modes. Our model indicates a dissipative (or collisional) to dephasing decay time ratio of 1 6 or less, and reproduces observed spectral features. We argue that the multi-mode semiclassical wave packet is more resistant to quantal interference than a single-mode one.
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