Time domain investigation on vibrational dephasing and spectral diffusion in CO-doped solid N-2

Infrared picosecond accumulated photon echo experiments have been performed fur the first time, using the Orsay Free Electron Laser, on the v = 0 --> v = 1 transition of CO in solid nitrogen. The vibrational dephasing time is found to be exceptionally long (T-2 greater than or equal to 120 ns) at lo w temperature. The analysis of the observed spectral diffusion leads one to assume different energy transfer mechanisms depending on the CO concentrat ion.