标题： 量子态分辨的速控OH与NO自由基的双分子碰撞 显示英文标题

标题： Quantum-state resolved bimolecular collisions of velocity-controlled OH with NO radicals

摘要： 尽管原子-分子碰撞已经以完整的量子态分辨率进行了研究，但两个状态选择的分子之间的相互作用却证明很难探测。 在这里，我们报告了两个都处于单一量子态的开壳层分子之间碰撞的状态分辨非弹性散射截面的测量。 Stark减速的OH自由基在交叉束配置中与六极聚焦的NO自由基发生散射。 在70到300 cm$^{-1}$的碰撞能量范围内，测量了旋转和自旋-轨道非弹性散射截面的绝对尺度。 这些截面与使用一组基于长程非绝热相互作用的从头算计算耦合模型势能面以及简化的短程相互作用的量子耦合通道计算结果有较好的一致性。 这种比较揭示了静电力在复杂分子碰撞过程中的关键作用。 显示英文摘要

摘要： Whereas atom-molecule collisions have been studied with complete quantum state resolution, interactions between two state-selected molecules have proven much harder to probe. Here, we report the measurement of state-resolved inelastic scattering cross sections for collisions between two open-shell molecules that are both prepared in a single quantum state. Stark-decelerated OH radicals were scattered with hexapole-focused NO radicals in a crossed beam configuration. Rotationally and spin-orbit inelastic scattering cross sections were measured on an absolute scale for collision energies between 70 and 300 cm$^{-1}$. These cross sections show fair agreement with quantum coupled-channels calculations using a set of coupled model potential energy surfaces based on ab initio calculations for the long-range non-adiabatic interactions and a simplistic short-range interaction. This comparison reveals the crucial role of electrostatic forces in complex molecular collision processes.