Exciton delocalization and initial dephasing dynamics of purple bacterial LH2

Article Abstract:

An attempt is made to study exciton dynamics associated with the B800 and B850 transitions of LH2 from Rhodobacter sphaeroides, employing ultrafast four-wave mixing spectroscopies. Data reveal that the enhanced transition dipole moment of B850 at the moment of excitation contracts significantly with a time constant of ~50 fs (for transient grating) due to exciton dephasing resulting in localization.

Usage, Spectrum analysis, Spectroscopy

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Dephasing-induced vibronic resonance in difference frequency generation spectroscopy

Article Abstract:

The difference frequency generation signal form a two electron level system with vibrational modes coupled to a Brownian oscillator bath is computed. Interference effects between two Liouville space pathways result in pure-dephasing-induced, excited-state resonances only if the two excitation pulses overlap and time ordering is not enforced.

Brownian motion

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Absorbance detected magnetic resonance spectra of the FMO complex of prosthecochloris aestuarii reconsidered: exciton simulations

Article Abstract:

The absorption, linear dichroic, circular dichroic, triplet-minusinglet (T-S) and LD(T-S) spectra are simultaneously analyzed by means of an exciton model. Simultaneous fitting of all available optical spectra with correct procedures offers a precise, detailed description of pigment-pigment interactions in the FMO complex.

Analysis, Nuclear magnetic resonance spectroscopy, Magnetic resonance, NMR spectroscopy

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