Excited-state structure determination of the green fluorescent protein chromophore.

@article{Usman2005ExcitedstateSD,
  title={Excited-state structure determination of the green fluorescent protein chromophore.},
  author={Anwar Usman and Omar Fouad Mohammed and Erik T J Nibbering and Jian Dong and Kyril M Solntsev and Laren M. Tolbert},
  journal={Journal of the American Chemical Society},
  year={2005},
  volume={127 32},
  pages={
          11214-5
        }
}
Ultrafast polarization-sensitive infrared (IR) spectroscopy of the C=O stretching mode of the chromophore of the green fluorescent protein reveals a near complete twisting around the ethylenic bridge between the phenolate and imidazolidinone groups upon electronic excitation, hinting at a decisive role of this motion in the efficient internal conversion process. 

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