The first step in vision: femtosecond isomerization of rhodopsin.
作者： R. Schoenlein , L. Peteanu , R. Mathies , C. Shank
关键词: Femtosecond 、 Chromophore 、 Absorption (electromagnetic radiation) 、 Isomerization 、 Retinal 、 Pulse (signal processing) 、 Rhodopsin 、 Excited state 、 Photochemistry 、 Chemistry
摘要: The kinetics of the primary event in vision have been resolved with use femtosecond optical measurement techniques. 11-cis retinal prosthetic group rhodopsin is excited a 35-femtosecond pump pulse at 500 nanometers, and transient changes absorption are measured between 450 580 nanometers 10-femtosecond probe pulse. Within 200 femtoseconds, an increased observed 540 indicating formation photoproduct on this time scale. These measurements demonstrate that first step vision, 11-cis----11-trans torsional isomerization chromophore, essentially complete only femtoseconds.
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