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The effect of conical intersections (CIs) on electronic relaxation,transitions from excited states to ground states, is well studied, but theirinfluence on hyperfine quenching in a reactant molecule is not known. Here, wereport on ultracold collision dynamics of the hydroxyl free-radical OH with Sratoms leading to quenching of OH hyperfine states. Our quantum-mechanicalcalculations of this process reveal that quenching is efficient due toanomalous molecular dynamics in the vicinity of the conical intersection atcollinear geometry. We observe wide scattering resonance features in bothelastic and inelastic rate coefficients at collision energies below k x 10 mK.They are identified as either p- or d-wave shape resonances. We also describethe electronic potentials relevant for these non-reactive collisions, theirdiabatization procedure, as well as the non-adiabatic coupling between thediabatic potentials near the CIs.

Effects of Conical Intersections on Hyperfine Quenching of Hydroxyl OH in collision with an ultracold Sr atom