Abstract
The bound-states of the H2O-para-H2 complex are computed using an adiabatic approximation which includes a diagonal Born-Oppenheimer correction (DBOC). Calculations are performed using the high-accuracy potential energy surface of Valiron et al. [J. Chem. Phys. 129, 134306 (2008). A good agreement is found between the DBOC calculations and 5D ‘exact' calculations, with a significant improvement of the standard adiabatic-hindered-rotor (AHR) approximation.