Monte Carlo calculations and gas phase mass spectrometry studies have been carried out on the system Ca+(H2O)n. The parameters used in the calculations to describe the interaction energy between Ca+and a water molecule are deduced from quantum mechanicalabinitiodeterminations. The clusters formation energies through the reaction Ca+(H2O)nminus;1+H2Othinsp;rlarr2;thinsp;Ca+(H2O)nhave been calculated forn=1 to 10 and determined from gas phase mass spectrometry forn=1 to 5. Forn=6 to 10, theoretical work shows that, though the most stable structures have six water molecules in a first shell surrounding Ca+, the statistical distribution increases from 5.28 to 5.63, due to the presence of many stable configurations with five water molecules in the first shell. A comparison is done with the system H3O+(H2O)n.
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