Cookies on this website
We use cookies to ensure that we give you the best experience on our website. If you click 'Continue' we'll assume that you are happy to receive all cookies and you won't see this message again. Click 'Find out more' for information on how to change your cookie settings.

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

DOI

10.1103/PhysRevLett.112.238301

Type

Journal article

Journal

Phys Rev Lett

Publication Date

13/06/2014

Volume

112

Keywords

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