Physics
Scientific paper
Jun 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986zphyd...3..121b&link_type=abstract
Zeitschrift für Physik D Atoms, Molecules and Clusters, Volume 3, Issue 2, pp.121-129
Physics
24
36.40
Scientific paper
Electronic structure effect in small metallic clusters up to n=15 are investigated through three series of experiments performed on one-valence-electron-atom clusters and two-valence-electron ones. In these experiments the cluster molecular beam is probed by photoionization mass spectroscopy, either by using a tunable laser source for alkali clusters or by synchrotron radiation for mercury ones. With alkali clusters the results are related to fragmentation effects, ionization potential measurements and photoionization efficiency curve profile analysis in the threshold region. The similar behavior of the homogeneous and heterogeneous clusters and the comparison with theoretical models suggest that for n≧3 the valence electrons are partially delocalized. This similarity against the electronic structure is not found in the nucleation process which generates homogeneous and heterogeneous clusters with a strong difference in their respective abundances. For mercury clusters the evolution with size for excitation spectra of two autoionizing lines is obtained up to n=8. Results show that they do not have a metallic character. This is also supported by the observation of small doubly charged mercury clusters for n≧5 which are stable against the Coulomb explosion.
Bréchignac C.
Cahuzac Ph.
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