Colloquium Speaker, David Beratan (Duke University), today, November 17, 2015 at 4pm

[Patterson, Robin L.]

Please take note of Colloquium taking place today, Tuesday, November 17, 2015 at 4:00 PM in The Robert Smith Seminar Room. There will be a reception in the Atrium at 3:45PM. Details concerning the talk are as follows:

Speaker:              David Beratan (Duke)
Date:                     Tuesday, November 17, 2015
Time:                     4:00 PM
Place:                    1080 Physics Research Building, The Robert Smith Seminar Room
Title:                     Light Harvesting and Delivery at the Molecular Scale: Oscillator Strength Focusing and Dexter Coupling Pathways


Abstract: Among the intrinsic physical constraints facing artificial photosynthesis are (1) the propensity for absorbing a photon and (2) the kinetics for delivering the electronic excitation energy to a reaction center.  My seminar focuses on understanding the underpinning constraints on light absorption by molecular species and on triplet energy transport kinetics through molecules.  We have established a theoretical framework to define and to assess molecular contributions to Dexter (exchange) coupling pathways for triplet energy transfer, allowing us to determine the significance of the charge-transfer (CT) mechanism proposed by Closs, Scholes and others.  The CT mechanism is viable at short distances but is  swamped by an explosion in the number of virtual bridge exciton pathways at moderate to longer distances.  We have also explored the distribution of oscillator strengths in molecules to understand why only a few percent of the integrated oscillator strength guaranteed by the Thomas-Reiche-Kuhn sum rule is available for solar energy harvesting.

The website for the colloquium is https://physics.osu.edu/physics-colloquium-schedule.



Robin
[The Ohio State University]
Robin Patterson
Undergraduate Program, Colloquium and Seminar Coordinator
Department of Physics
1040K Physics Research Building, 191 W. Woodruff Avenue, Columbus, OH 43210
(614) 292-8523 Office     (614) 292-7557 Fax
patterson.716 at osu.edu<mailto:patterson.716 at osu.edu> osu.edu<http://osu.edu/>

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