✦ LIBER ✦

Femtosecond vibrational dynamics and relaxation in the core light-harvesting complex of photosynthetic purple bacteria

✍ Scribed by Mirianas Chachisvilis; Villy Sundström

Publisher: Elsevier Science
Year: 1996
Tongue: English
Weight: 719 KB
Volume: 261
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(96)00939-6

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✦ Synopsis

Using 50 fs light pulses we have observed the wavelength dependent phase shifts of oscillatory transients in the transient absorption kinetics of the LHI complex from purple bacteria at 77 K. We applied the density operator formalism in Liouville space in combination with Redfield relaxation theory to calculate the transient absorption response of the model system consisting of three electronic states and one vibrational mode linearly coupled to the thermal bath. This enabled us to estimate relative displacements of the potential energy surfaces in the higher excited states of the LHI complex and investigate the influence of coherence transfer processes.

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