  We study the potential energy surface of the ozone molecule by means of
Quantum Monte Carlo simulations based on the resonating valence bond concept.
The trial wave function consists of an antisymmetrized geminal power arranged
in a single-determinant that is multiplied by a Jastrow correlation factor.
Whereas the determinantal part incorporates static correlation effects, the
augmented real-space correlation factor accounts for the dynamics electron
correlation. The accuracy of this approach is demonstrated by computing the
potential energy surface for the ozone molecule in three vibrational states:
symmetric, asymmetric and scissoring. We find that the employed wave function
provides a detailed description of rather strongly-correlated multi-reference
systems, which is in quantitative agreement with experiment.
