Abstract
Femtosecond infrared transient grating and three pulse photon-echo experiments have been performed to investigate the vibrational dynamics of the CN stretching mode of Fe(CN) 6 4− in H 2O. From the transient grating measurements, it was found that the vibrational population relaxation in H 2O occurs about six times faster than that in D 2O. This reflects the strong coupling to solvent modes for the vibrational relaxation. On the other hand, the photon-echo experiments have shown that the time-scales of the spectral diffusion processes are similar in H 2O and D 2O.
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