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How molecules convert light energy to perform a specific transformation is a fundamental question in photophysics. Ultrafast spectroscopy reveals the kinetics associated with electronic energy flow, but little is known about how absorbed photon energy drives nuclear motion. Here we used ultrabroadband transient absorption spectroscopy to monitor coherent vibrational energy flow after photoexcitation of the retinal chromophore. In the proton pump bacteriorhodopsin, we observed coherent activation of hydrogen-out-of-plane wagging and backbone torsional modes that were replaced by unreactive coordinates in the solution environment, concomitant with a deactivation of the reactive relaxation pathway.

Original publication




Journal article


Phys Rev Lett

Publication Date





Absorption, Bacteriorhodopsins, Kinetics, Photochemical Processes, Photons, Retinaldehyde, Schiff Bases, Spectroscopy, Near-Infrared, Spectrum Analysis, Raman, Thermodynamics, Vibration