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The dynamics of molecular multiphoton ionization and fragmentation of a diatomic moleeule (Na2) have been studied in molecular beamexperiments.Femtosecond laser pulses froman amplified colliding-pulse mode-Iocked (CPM) ring dye laser are employed to induce and probe the molecular transitions.The final continuum states are analyzed by photoelectron spectroscopy, by ion massspectrometry and by measuring the kineticenergyof the formed ionic fragments.Pump-probe spectraemploying 70-fs laser pulses have beenmeasured to study the time dependence of molecular multiphoton ionization and fragmentation.The oscillatory structure of the transient spectra showing the dynamics on the femtosecond time scale can best be understood in termsof the motion of wave packets in boundmolecular potentials.The transient Na2+ ionization and the transient Na" fragmentation spectrashow that contributions from direct photoionization of a singly exeited electronie stateand from excitation andautoionization ofabound doubly excited molecular statedetermine the timeevolution of molecular multiphoton ionization.
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Baumert et al. (1991) studied this question.
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