Test studies on the potential energy surface and rate constant for the OH+O3 atmospheric reaction

We report a single-valued potential energy surface for HO4(2A) from the double many-body expansion method. All n-body (n=2–4) energy terms are taken from published studies on the relevant fragments, with a five-body energy term of Gaussian form added to mimic the experimental activation energy for the OH(v=0)+O3 reaction. A detailed dynamics study of this reaction is also reported using classical trajectories. Good agreement with existing experimental data is obtained.