Abstract
Mercury clusters were generated in a pure-gas beam expansion and ionized by electron impact. The quadrupole mass spectra show singly ionized clusters up to Hg 8 +. At ionization energies above 22 eV doubly ionized mass peaks Hg n 2+ appear for 5 ≤ n ≤ 15. The observation of Hg 5 2+ is well below the critical size for Coulomb explosions, calculated as sphere and as chain-like models. Most of the discrepancy can be explained with polarization forces. Systematic second ionization potential measurements of the clusters support the proposed model.
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