| Abstract
| - The geometric and electronic structures of aluminum binary clusters, AlnX (X = Si and P), have beeninvestigated, using mass spectrometry, anion photoelectron spectroscopy, photoionization spectroscopy, andtheoretical calculations. Both experimental and theoretical results show that Al12Si has a high ionization energyand low electron affinity and Al12P has a low ionization energy, both with the icosahedral structure havinga central Si or P atom, revealing that Al12Si and Al12P exhibit rare-gas-like and alkali superatoms, respectively.Experiments confirmed the possibility that the change in the total number of valence electrons on substitutioncould produce ionically bound binary superatom complexes, the binary cluster salts Al12P+F- and Al12B-Cs+.
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