Abstract

The few-body method for treating water molecules is presented. H2O can be regarded as a three-body system. The total three-body wavefunction is expanded in terms of the harmonic oscillator product states in the Jacobi coordinates. The binding energies are calculated by using a pairwise model potential in the variational approach. The geometry and modes of internal motion are analyzed by the shape density function. The results are E = -76.07 a.u, RHO = 0.970 Å and ∠HOH = 105.38°. These results are compared with some known calculations and experimental values.

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