Abstract
The resonance Raman (RR) spectrum of a K-intermediate formed during the photoreaction of an artificial bacteriorhodopsin (BR) pigment (derived from E-11,20 ethanoretinal) containing a six-membered ring spanning the C 11 =C 12 -C 13 region of the retinal chromophore (BR6.11) is recorded by picosecond time-resolved resonance Raman (PTR 3 ) spectroscopy. A recent study of the BR6.11 photoreaction utilizing picosecond transient absorption and picosecond time-resolved fluorescence measurements revealed that (i) a J-intermediate (J6.11) appears within <3 ps and decays to form a K-intermediate, K6.11/1, with a 12±3 ps time constant and (ii) a second K-intermediate, K6.11/2, is subsequently formed from K6.11/1 with an ≃100-ps time constant
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