Abstract
Results of ab initio calculations of the (H2O)5/(H2O)5− systems are presented. The main conclusions of the study are as follows: Based on the calculations we predict that water pentamer anions are metastable systems in agreement with their weak spectral manifestation in the gas-phase experiments of Bowen and co-workers; the excess electrons in all five structural isomers of the water pentamer anion found in the calculations are attached to the clusters by virtue of a dipole–electron interaction; the (H2O)5− anions found in the calculations are close in energy but have different vertical electron detachment energies ranging from 143 to 395 meV.
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