Vibrational dynamics in molecular condensed phases with the CLIO free electron laser

Single color pump-probe and photon-echo experiments have been performed on the CO stretching mode of W(CO)(6) at about 1983cm(-1) in various liquids and solid environments. Combined with absorption data, the measured T-1 and T-2 times suggest the following conclusions: in all liquids studied, the IR absorption band is homogeneously broadened, whereas, inhomogeneous broadening is observed in solid matrices and in a xerogel. Ar low temperature, the echo decay is much faster in methane than in argon host.