Direct identification and decongestion of Fermi resonances by control of pulse time ordering in two-dimensional IR spectroscopy.

@article{Donaldson2007DirectIA,
  title={Direct identification and decongestion of Fermi resonances by control of pulse time ordering in two-dimensional IR spectroscopy.},
  author={Paul M Donaldson and Rui Guo and Fr{\'e}d{\'e}ric Fournier and Elizabeth M. Gardner and Laura M. C. Barter and Chris J Barnett and Ian R. Gould and David R. Klug and Donna J. Palmer and Keith R. Willison},
  journal={The Journal of chemical physics},
  year={2007},
  volume={127 11},
  pages={114513}
}
We show that it is possible to both directly measure and directly calculate Fermi resonance couplings in benzene. The measurement method used was a particular form of two-dimensional infrared spectroscopy (2D-IR) known as doubly vibrationally enhanced four wave mixing. By using different pulse orderings, vibrational cross peaks could be measured either purely at the frequencies of the base vibrational states or split by the coupling energy. This capability is a feature currently unique to this… CONTINUE READING