Rydberg Molecules for Ion-Atom Scattering in the Ultracold Regime.
Rydberg Molecules for Ion-Atom Scattering in the Ultracold Regime.
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DOI：
10.1103/physrevlett.120.153401
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发表时间：
2017-09
影响因子：
8.6
通讯作者：
M. Tomza;Thomas Schmid;C. Veit;Nicolas Zuber;R. Löw;Tilman Pfau;Michal Tarana
中科院分区：
文献类型：
--
作者：
M. Tomza;Thomas Schmid;C. Veit;Nicolas Zuber;R. Löw;Tilman Pfau;Michal Tarana
我们提出了一种新的实验方法，以扩大调查的离子-原子碰撞从迄今为止研究的冷，本质上是经典制度的超冷，量子制度。该方法的关键是使用里德伯分子来初始化超冷离子-原子散射事件。我们将所提出的方法与锂离子-原子系统，我们提出了模拟的初始里德堡分子波函数，自由光电离，在离子-原子散射势的存在下演变。我们从从头计算的相互作用势的离子-原子散射长度预测的界限。我们证明，在预测的范围内，散射长度可以实验确定的散射波包的速度在^{6}Li^{+}-^{6}Li和从分子离子分数在^{7}Li^{+}-^{7}Li的情况下。所提出的利用里德伯分子进行超冷离子-原子散射的方法，特别是针对锂离子-原子系统，也很容易适用于其他离子-原子系统。
We propose a novel experimental method to extend the investigation of ion-atom collisions from the so far studied cold, essentially classical regime to the ultracold, quantum regime. The key aspect of this method is the use of Rydberg molecules to initialize the ultracold ion-atom scattering event. We exemplify the proposed method with the lithium ion-atom system, for which we present simulations of how the initial Rydberg molecule wave function, freed by photoionization, evolves in the presence of the ion-atom scattering potential. We predict bounds for the ion-atom scattering length from ab initio calculations of the interaction potential. We demonstrate that, in the predicted bounds, the scattering length can be experimentally determined from the velocity of the scattered wave packet in the case of ^{6}Li^{+}-^{6}Li and from the molecular ion fraction in the case of ^{7}Li^{+}-^{7}Li. The proposed method to utilize Rydberg molecules for ultracold ion-atom scattering, here particularized for the lithium ion-atom system, is readily applicable to other ion-atom systems as well.