State-to-state inelastic scattering of Stark-decelerated OH radicals with Ar atoms.
State-to-state inelastic scattering of Stark-decelerated OH radicals with Ar atoms.
复制标题
Stark 减速 OH 自由基与 Ar 原子的状态间非弹性散射。
DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
S. V. D. van de Meerakker
中科院分区：
文献类型：
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作者：
L. Scharfenberg;J. Kłos;P. Dagdigian;M. Alexander;G. Meijer;S. V. D. van de Meerakker
斯塔克减速方法利用带电粒子加速器物理学的概念来产生具有可调速度的分子束。这些驯服的分子束提供了有趣的观点，精确的交叉光束散射研究作为碰撞能量的函数。该方法已经足够先进的竞争与国家的最先进的光束方法，用于散射研究。这在这里被证明为OH自由基（X（2）Pi（3/2），J = 3/2，f）与Ar原子的散射，开壳层分子与原子的散射的基准系统。宇称分辨积分态到态非弹性散射截面是在80和800 cm（-1）之间的碰撞能量下测量的。精确地确定了13个非弹性散射通道的阈值行为和碰撞能量依赖性。获得了极好的协议与最准确的从头算OH + Ar势能面的基础上紧密耦合散射计算预测的横截面。
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.