FRAGMENTATION PROBABILITIES OF EXCITED ALKALI CLUSTERS

S. Rutz, K. Kobe, H. Kühling, A. Ruff, E. Schreiber, G. Sommerer and L. Wöste
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S. Rutz: Freie Universität Berlin, Institut für Experimentalphysik, Arnimallee 14, 14195 Berlin, Germany
K. Kobe: Freie Universität Berlin, Institut für Experimentalphysik, Arnimallee 14, 14195 Berlin, Germany
H. Kühling: Freie Universität Berlin, Institut für Experimentalphysik, Arnimallee 14, 14195 Berlin, Germany
A. Ruff: Freie Universität Berlin, Institut für Experimentalphysik, Arnimallee 14, 14195 Berlin, Germany
E. Schreiber: Freie Universität Berlin, Institut für Experimentalphysik, Arnimallee 14, 14195 Berlin, Germany
G. Sommerer: Freie Universität Berlin, Institut für Experimentalphysik, Arnimallee 14, 14195 Berlin, Germany
L. Wöste: Freie Universität Berlin, Institut für Experimentalphysik, Arnimallee 14, 14195 Berlin, Germany

Surface Review and Letters (SRL), 1996, vol. 03, issue 01, 583-589

Abstract: Employing transient resonant two-color two-photon ionization spectroscopy in the picosecond and femtosecond regime, we have investigated the fragmentation dynamics of several excited electronic states of alkali clusters. In the case of theNa3C-state a simple energy-level model well describes the single exponential decay found for the temporal evolution of the transient spectra. This allowed to estimate fragmentation probabilities of the C-state vibrational bands as well as the onset of predissociation. For larger clusters,Nanas well asKnwithn≥3, the ultrafast transients could be measured. By means of an improved fragmentation model the fragmentation probabilities are determined as a function of the cluster size. Significant differences between.NanandKnclusters are discussed.

Date: 1996
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DOI: 10.1142/S0218625X96001054

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