Abstract
We observe, using electronic two-dimensional photon echo spectroscopy, that the cis and trans potential energy surfaces of the ultrafast isomerization of retinal in bacteriorhodopsin are mixed via the hydrogen out of plane (HOOP) mode.
Highlights
The ultrafast isomerization reaction of retinal in bacteriorhodopsin is a model system for the primary events underlying our sense of vision
We observe, using electronic two-dimensional photon echo spectroscopy, that the cis and trans potential energy surfaces of the ultrafast isomerization of retinal in bacteriorhodopsin are mixed via the hydrogen out of plane (HOOP) mode
To better understand the role quantum dynamics plays in this process, we performed electronic two-dimensional photon echo (2DPE) spectroscopy on bR reconstituted in lipid nanodiscs
Summary
The ultrafast isomerization reaction of retinal in bacteriorhodopsin (bR) is a model system for the primary events underlying our sense of vision. These lipid nanodiscs greatly reduce scattering in the sample, resulting in an enhancement of the signal to noise in our measurements by a factor of ∼ 10 over previous efforts with bR in native purple membranes [1]
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