A Few Basics on the Theoretical Approach to Real-Time Spectroscopy

2 A Few Basics on the Theoretical Approach to Real-Time Spectroscopy 

The experiments presented here, require in some cases sophisticated theoretical approaches. The calculations of the wave packet propagation (Sect. 2.2.1) observed for excited dimers and trimers (Chap. 3) are of this special kind. The photodissociation phenomena (Chap. 4), however, can be treated by two rather easy approaches, as described in Sect. 2.2.2. The essentials of thefirst theoretical approaches to interpretion of the results on ultrafast structural relaxation (Chap. 5) obtained by the NeNePo technique are summarized in Sect. 2.2.3. 

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