Energy transfer and spectral dynamics of the three lowest energy Qy-states of the Fenna-Matthews-Olson antenna complex

Article Abstract:

The three lowest Qy-states of Chlorobium tepidum's Fenna-Matthews-Olson (FMO) bacteriochlorophyll alpha antenna complex lie at 823, 825 and 827 nm. This was gleaned from a study of the said states, which presented temperature-dependent spectral hole burning results. Results further indicated that the three lowest Qy-states were associated with the lowest energy state of the subunit of the FMO trimer. The study validated earlier findings by pump-probe experiments that there exists a lifetime of 2 ns for the 827 nm state in the low-temperature limit.

Energy transfer, Spectral energy distribution

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Using fractional desorption spectroscopy to determine kinetic parameters for surface processes

Article Abstract:

Fractional desorption spectroscopy (FDS) employs a modulated temperature program during the desorption experiment by using a modified Arrhenius analysis to extract kinetic parameters from desorption rate vs temperature data. It improves on other differential methods in two significant aspects. First, it allows the determination of the activation energy over a range of accessible surface concentrations in a single adsorption/desorption experiment. Second, it has a unique self-diagnostic and system-diagnostic abilities.

Usage, Surface chemistry, Spectroscope, Spectroscopes

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