AutoCAD 2014

A Minimal Model of the Retinal by Many Body Perturbation Theory

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The very first step of the mechanism of vision in animals is the photoisomerization, caused by the absorption of a photon, of the Retinal located inside the rhodopsin in the retina of eyes.
This process has been studied both experimentally and theoretically with the help of model photo-active molecules. Thanks to its small dimensions and common features of the isomerization pathway with the Retinal, the Protonated Schiff Base Minimal Model (C5H6NH+2 ), is the most studied model. In collaboration with Adriano Mosca Conte, Rodolfo Del Sole and Olivia Pulci at Univ. of Rome "Tor Vergata", we investigate its optical properties along the isomerization pathway by ab-initio calculations based on Many-Body Perturbation Theory (MBPT): GWmethod and the Bethe-Salpeter equation. The MBPT calculations agrees with post-Hartree Fock and Quantum Monte Carlo calculations and confirm a two-state model interpretation of the Minimal Model photo-isomerization. TDDFT outcomes qualitatively differ from these results.



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