Abstract
The dynamics of excited states of cold Na3-clusters in a supersonic beam have been studied in time-resolved two-photon-ionization (TPI)-experiments, using picosecond pump&probe technique followed by mass-selective detection. In case of the electronically excited B-state for the first time the pseudorotational motion could be recorded as a temporal sequence. The time constant of pseudorotation was found to be 3ps. For the D-state, known to predissociate very rapidly, it was possible to directly ionize this excited electronic state. Decay times of the TPI-signal were estimated to be in the order of 2.7ps providing direct information of the fragmentation probability. Simultaneously the temporal evolution of the fragment signal Na +2 was detected.
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