and inhomogeneous broadening in a polymer as a function of temperature.34. In this paper, the results of measurements of temperature-dependent spectral ...
Vibrational spectral diffusion and population dynamics in a glass-forming liquid: Variable bandwidth picosecond infrared spectroscopy A. Tokmakoff, R. S. Urdahl, D. Zimdars, R. S. Francis, A. S. Kwok, and M. D. Fayer Department of Chemistry, Stanford University, Stanford, California 94305
~Received 19 October 1994; accepted 29 November 1994! The temperature-dependent vibrational population dynamics and spectral diffusion of the CO stretching mode of tungsten hexacarbonyl in 2-methylpentane are observed from the room temperature liquid to the low temperature glass using picosecond infrared transient grating and pump–probe experiments. These experiments were performed between 10 and 300 K on the triply degenerate T 1u asymmetric CO stretching mode at 1984 cm21 using pulses with bandwidths narrower and wider than the absorption bandwidth of the transition. The rate of vibrational population relaxation ~100
