Abstract
Absorption and emission spectroscopies of photodissociating molecules are very refined tools for probing the short-lived transient species. The analogy between the energy or the time dependent versions of the quantum theory is discussed for the three successive steps of the dynamical process : photon absorption, radiative relaxation by Raman emission and final energy redistribution in the fragments. It is shown how informations concerning these different time scale processes can be related to the parameters of the potential energy surfaces and to the excitation laser wavelength. Two well-documented triatomic systems, namely ICN and 03 are considered to illustrate how absorption and emission spectra can be used to study reaction dynamics.
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