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The protonated Schiff base of the 11-cis retinal (PSB11) is the chromophore of the visual pigment Rhodopsin (Rh). The biological activity of Rh is triggered by an ultrafast (200 fs) and efficient (0.65 quantum yield) light-induced cis-trans isomerization of PSB11 around the 11=12 double bond [1], which can be described as the ballistic motion of a photoexcited wavepacket from the Franck-Condon (FC)...
Light perception is based on a cascade of complex biochemical reactions whose first step is the ultrafast (completed in ≈200 fs) and efficient (0.65 quantum yield) isomerisation of the retinal chromophore of rhodopsin around the 11=12 double bond from the 11-cis to the all-trans form (Fig. 1) [1]. It is now well established that rhodopsin's unique reactivity is mediated by conical intersections (CIs),...
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