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We report on the high resolution studies of the temperature (T) dependence ofthe q=0 phonon spectrum in the quasi one-dimensional charge density wave (CDW)compound K0.3MoO3 utilizing time-resolved optical spectroscopy. Numerous modesthat appear below Tc show pronounced T-dependences of their amplitudes,frequencies and dampings. Utilizing the time-dependent Ginzburg-Landau theorywe show that these modes result from linear coupling of the electronic part ofthe order parameter to the 2kF phonons, while the (electronic) CDW amplitudemode is overdamped.

Disentanglement of the electronic and lattice parts of the order parameter in a 1D Charge Density Wave system probed by femtosecond spectroscopy