Abstract
Femtosecond time-resolved four-wave mixing (FWM) spectroscopy is performed in order to investigate molecular dynamics in iodine molecules in the gas phase. Depending on both the timing of the laser pulses and on the applied FWM technique different dynamics are observed in the FWM transient signals. By using the time-evolution diagrams the varying contribution of ground and excited state dynamics can be explained conclusively. Further, a femtosecond three-color pump-dump-probe scheme in combination with a time-of-flight mass selective detection unit has been applied to study vibrational wave packet dynamics in the electronic ground state of cold K 2 molecules. A spectral analysis of the time domain signal reveals two different wave packet contributions: hot wave packets from a stimulated Raman process and cold ones from stimulated emission pumping.
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