The relative abundances of mediumhyphen;size clusters X(+,minus;,0)nof X=Si, Ge, Sn, or Pb, with 7le;nle;30, as prepared in various ways after vaporhyphen;phase condensation, are determined by enthalpic, entropic, and dynamic factors. Valence electronic structure determines chemical trends in (magic number) peaks in these relative abundances. Theoretical models of the valence structure explain these trendsindetail. New cylindrical structures are identified atn=15, 18, and 21 for X(minus;)nwith X=Si and Ge. General trends in ionization potentials and electron affinities are discussed.
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