Abstract

Evidence for the existence of magic numbers for cluster ions of argon atoms and nitrogen molecules has been found with high molecular weight mass spectra of their cluster ions. The observed numbers of 145, 303, 550, and 912 in mass spectra of cluster ions coincides within experimental error limit with the number of particles required for complete shell icosahedra. Failure to observe similar magic number structures in mass spectra of polyatomic molecule cluster ions and differences between polyatomic molecule cluster ion mass spectra and the argon and nitrogen cluster ion spectra are discussed.

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