Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany.
Phys Chem Chem Phys. 2010 Sep 28;12(36):10660-70. doi: 10.1039/c004422a. Epub 2010 Jul 23.
The Stark deceleration method exploits the concepts of charged particle accelerator physics to produce molecular beams with a tunable velocity. These tamed molecular beams offer interesting perspectives for precise crossed beam scattering studies as a function of the collision energy. The method has advanced sufficiently to compete with state-of-the-art beam methods that are used for scattering studies throughout. This is demonstrated here for the scattering of OH radicals (X(2)Pi(3/2), J = 3/2, f) with Ar atoms, a benchmark system for the scattering of open-shell molecules with atoms. Parity-resolved integral state-to-state inelastic scattering cross sections are measured at collision energies between 80 and 800 cm(-1). The threshold behavior and collision energy dependence of 13 inelastic scattering channels is accurately determined. Excellent agreement is obtained with the cross sections predicted by close-coupling scattering calculations based on the most accurate ab initio OH + Ar potential energy surfaces to date.
斯塔克减速法利用带电粒子加速器物理的概念来产生速度可调的分子束。这些驯服的分子束为精确的交叉束散射研究提供了有趣的视角，作为碰撞能量的函数。该方法已经足够先进，可以与用于整个散射研究的最先进的光束方法竞争。在这里，我们以 OH 自由基（X(2)Pi(3/2)，J = 3/2，f）与 Ar 原子的散射为例，这是一个用于与原子散射的开壳分子的基准体系。在 80 到 800 cm(-1) 的碰撞能下测量了奇偶分辨的整体态到态非弹性散射截面。准确地确定了 13 个非弹性散射通道的阈值行为和碰撞能依赖性。与基于迄今为止最精确的从头算 OH + Ar 势能面的紧密耦合散射计算所预测的截面非常吻合。
