The effect of conical intersections (CIs) on electronic relaxation, transitions from excited states to ground states, is well studied, but their influence on hyperfine quenching in a reactant molecule is not known. Here, we report on ultracold collision dynamics of the hydroxyl free-radical OH with Sr atoms leading to quenching of OH hyperfine states. Our quantum-mechanical calculations of this process reveal that quenching is efficient due to anomalous molecular dynamics in the vicinity of the conical intersection at collinear geometry. We observe wide scattering resonance features in both elastic and inelastic rate coefficients at collision energies below $$k_{ext {B}}imes 10 , hbox {mK}$$ . They are identified as either p- or d-wave shape resonances. We also describe the electronic potentials relevant for these non-reactive collisions, their diabatization procedure, as well as the non-adiabatic coupling between the diabatic potentials near the CIs.
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机译：锥形交叉点（CIS）对电子放松的影响，从激发状态转变为地态，良好地研究，但它们对反应分子中的高血清猝灭的影响是不详的。在这里，我们报告羟基自由基OH与Sr原子的ultachold碰撞动力学，导致oh Hyperfine状态猝灭。我们对该过程的量子力学计算表明，由于共线几何形状的锥形交叉中心附近的异常分子动态，淬火是有效的。在$$ k { text {b}} times 10 ， hbox {mk} $$上，观察到碰撞能量的弹性和无弹性速率系数中的宽散射谐振特征。它们被识别为P型或D波形共振。我们还描述了与这些非反应性碰撞，其糖尿病潜力相关的电子电位，以及顺式附近的糖尿病势之间的非绝热偶联。
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