Stochastic Simulation of Chemical Exchange in Two Dimensional Infrared   Spectroscopy
  The stochastic Liouville equations are employed to investigate the combined signatures of chemical exchange (two-state-jump) and spectral diffusion (coupling to an overdamped Brownian oscillator) in the coherent response of an anharmonic vibration to three femtosecond infrared pulses. Simulations reproduce the main features recently observed in the OD stretch of phenol in benzene. 
Frantisek Sanda and Shaul Mukamel