论文标题
低能共振在冷+D2碰撞的立体动力学中的作用
The role of low energy resonances in the stereodynamics of cold He+D2 collisions
论文作者
论文摘要
在使用Stark诱导的绝热拉曼通道（SARP）技术的最新实验中，Zhou等。在冷碰撞能量下，测量了He和对齐D2分子之间碰撞的产物分布。角分布的特征归因于在低能量下控制散射的L = 2共振。此处使用HE-H2系统具有高度准确的相互作用潜力，对此问题进行了量子机械处理。取而代之的是，我们的结果预测在低能量下非常强烈的L = 1共振，导致角度分布与实验中测得的分布不同。只有当L = 1共振被人为地消除时，才能通过排除实验速度分布中的最低能量来实现与实验的良好一致。我们的分析表明，当相互作用势在其预测的不确定性中修改时，L = 1共振的位置和强度都没有显着变化。能量分辨的测量可能有助于解决差异。
In recent experiments using the Stark-induced Adiabatic Raman Passage (SARP) technique, Zhou et al. measured the product's angular distribution for the collisions between He and aligned D2 molecules at cold collision energies. The signatures of the angular distributions were attributed to a l=2 resonance that governs scattering at low energies. A first principles quantum mechanical treatment of this problem is presented here using a highly accurate interaction potential for the He-H2 system. Instead, our results predict a very intense l=1 resonance at low energies, leading to angular distributions that differ from those measured in the experiment. A good agreement with the experiment is achieved only when the l=1 resonance is artificially removed, for example, by excluding the lowest energies present in the experimental velocity distribution. Our analysis revealed that neither the position nor the intensity of the l=1 resonance significantly changes when the interaction potential is modified within its predicted uncertainties. Energy-resolved measurements may help to resolve the discrepancy.
