Ultracold collisions and reactions of vibrationally excited OH radicals with oxygen atoms*

We report quantum dynamics calculations of O + OH ($v=1,j=0$) collisions on two different representations of the electronic ground state potential energy surface. A time-independent quantum mechanical method has been applied, using hyperspherical coordinates. Probabilities and cross sections are calculated for the elastic, inelastic, and reactive channels, and for $J=0$ total angular momentum. Results show that the reaction outcome is strongly influenced by long-range forces, and that the competition between vibrational quenching and chemical reactivity is found to be sensitive to the choice of the potential energy surface.