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The work presents the detailed analysis of the water dimer properties. Theirparameters are investigated on the basis of a multipole interaction potentialextended up to the quadrupole--quadrupole and dipole--octupole terms. All mainequilibrium parameters of the dimer are obtained: its geometry, ground-stateenergy, dipole and quadrupole moments, vibration frequencies, {\it etc}. Theyare thoroughly compared with those obtained in quantum chemical calculationsand from spectroscopic data. The efficiency of the present model potentials isdiscussed. A new viewpoint on the nature of the hydrogen bond is presented. Theresults of studies are thoroughly compared with the spectroscopic and computersimulation data.

Dimerization of Water Molecules. Modeling of the Attractive Part of the Interparticle Potential in the Multipole Approximation