Abstract

An electron-diffraction study of the structure of free clusters of Ar is carried out in the interval of mean sizes N̄≈600–1500 atoms/cluster. The existence of an amorphous (polyicosahedral) phase in large rare gas clusters with N̄≈600–800 atoms/cluster is observed for the first time. It is shown that with increasing number of atoms in a cluster a transition to a multilayer icosahedral (ordered) phase occurs in a rather narrow size interval.

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