Partial wave resonances are quasi-bound states that are formed by tunneling through the centrifugal barrier. Such states are important to collisions that deviate from the Langevin limit where direct collision path is suppressed due to quantum symmetry or a potential barrier. In such a case, quantum resonances play a major role in the dynamics at low temperatures where scattering process can be described mainly by the resonance contribution. Here we present the first observation of the lowest-lying partial wave resonance in the Penning ionization collisions between metastable neon and rovibrationally ground state HD molecules. We observe the resonance at an energy of $k_B\times$22mK taking advantage of the phase space correlation similar to atomic delta kick cooling. We show that the $p$-wave resonance position is particularly sensitive to the leading term of the van der Waals interaction. We also measure shape resonance at a higher angular momentum state, $l=6$, allowing us to disentangle and probe the short and the long parts of the intermolecular interaction.
A method for accurate electron-atom resonances: The complex-scaled multiconfigurational spin-tensor electron propagator method for the $^2P\, \mbox{Be}^{-}$ shape resonance problem
Phase-amplitude formalism for ultra-narrow shape resonances
我们应用Milne的相幅表示[W. E. Milne，Phys.Rev.35，863（1930）]的散射问题，涉及不相交的经典允许的区域分开的障碍。具体来说，我们开发了一种形式主义，采用不同的振幅和相位函数-每组解决方案优化一个单独的区域-我们使用这些局部适应的解决方案，以获得真正的散射相移和准确的隧道速率的超窄形状共振值。我们展示了一个有吸引力的潜在的一个大的离心障碍的说明性例子的结果。
Two-pulse field-free orientation reveals anisotropy of molecular shape resonance
我们报告的宏观无场取向的观察，即超过73%的CO分子指向同一方向。这是通过在高颗粒密度（$>10^{17}$ cm $^{-3}$）下操作的全光学方案来实现的，该方案组合了单色（$ω$）和双色（$ω+ 2ω$）非共振飞秒激光脉冲。我们表明，所实现的方向完全依赖于超极化相互作用，而不是电离耗尽机制，从而打开了广泛的应用。所实现的强取向使我们能够揭示由形状共振引起的光复合振幅和相位的分子框架各向异性。在28~eV附近的偶次谐波发射中出现共振的局部极大值。与此相反，奇次谐波发射被抑制在这个光谱区域中，通过一个不对称的光复合阶段和一个子周期斯塔克效应，通用的极性分子，我们实验确定的综合效果。
Asymptotic model for shape resonance control of diatomics by intense non-resonant light: Universality in the single-channel approximation
非共振光通过极化率各向异性与光子相互作用耦合不同的转动态，并可能导致运动的强杂化。基于散射的长程性质，可以通过渐近模型完全捕获由于这种相互作用引起的形状共振和低能散射状态的修改[Crubellier et al. arXiv：1412.0569]。值得注意的是，在这种渐近多通道描述的场修整形状共振的属性被发现是近似线性的场强度相当大的强度。这表明微扰单通道方法足以研究由非共振场控制这种共振。多通道的结果还表明，依赖于场强目前，至少近似，普遍的特点。本文将节线法与微扰理论相结合求解渐近薛定谔方程。比较我们的单通道的结果与充分的相互作用势得到的结果，我们发现节线只依赖于无场散射长度的硅藻产生近似的，但普遍的描述的场修饰的分子，确认普遍的行为。
