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Femtosecond dynamics of molecular and cluster ionization and fragmentation

The real-time dynamics of molecular (Na_2 . Na_3) and cluster Na_n (n=4-2l) multiphoton ionization and -fragmentation has been studied in beam experiments applying femtosecond pump-probe techniques in combination with ion and electron spectroscopy. Wave packet motion in the dimer Na_2 reveals two independent multiphoton ionization processes while the higher dimensional motion in the trimer Na_3 reflects the chaotic vibrational motion in this floppy system. The first studies of cluster properties (energy, bandwidth and lifetime of intermediate resonances Na^_n) ) with femtosecond laser pulses give a striking illustration of the transition from "molecule-like" excitations to "surfaceplasma"-like resonances for increasing cluster sizes. Time-resolved fragmentation of cluster ions Na_n^ indicate that direct photo-induced fragmentation processes are more important at short times than the statistical unimolecular decay.

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@article{urn:nbn:de:hebis:34-2008102924983,
  author    ={Baumert, Thomas and Thalweiser, Rainer and Weiß, Volker C. and Gerber, Gustav},
  title    ={Femtosecond dynamics of molecular and cluster ionization and fragmentation},
  copyright  ={https://rightsstatements.org/page/InC/1.0/},
  language ={en},
  year   ={1993}
}