Retinal chromophore of rhodopsin photoisomerizes within picoseconds

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Science  27 Feb 1981:
Vol. 211, Issue 4485, pp. 942-944
DOI: 10.1126/science.7466366


A new picosecond resonance Raman technique shows that resonance Raman lines characteristic of a distorted all-trans retinal appear within 30 picoseconds after photolysis of rhodopsin or isorhodopsin. This finding suggests that isomerization is nearly complete within picoseconds of the absorption of a photon.