Excitation-assisted nonadiabatic charge-transfer reaction in a mixed atom-ion system
Excitation-assisted nonadiabatic charge-transfer reaction in a mixed atom-ion system
复制标题
DOI：
10.1103/physreva.99.062706
复制
发表时间：
2019-06-14
影响因子：
2.9
通讯作者：
Kotochigova, Svetlana
中科院分区：
文献类型：
--
作者：
Li, Ming;Mills, Michael;Kotochigova, Svetlana
中性离子系统特有的一个重要物理过程是电荷转移反应。在这里，我们提出了测量和模型的电荷转移过程之间的共捕获超冷Ca原子和Yb离子在良好的控制条件下。理论分析表明，存在三种反应机制时，激光从磁光阱和一个额外的催化剂激光。结果表明，激发态Ca（P-1（1））+ Yb+（S-2）和Ca+（S-2）+ Yb（D-3（2））的渐近极限的近简并性导致了较大的电荷转移速率系数，而这种电荷转移速率系数可以通过改变催化剂激光器的频率和离子温度来控制。我们的模型与实验速率系数测量值之间的50 mK和1 K，有和没有催化剂激光器，只使用一个单一的自由参数。
An important physical process unique to neutral-ion systems is the charge-transfer reaction. Here, we present measurements of and models for charge-transfer processes between cotrapped ultracold Ca atoms and Yb ions under well-controlled conditions. The theoretical analysis suggests the existence of three reaction mechanisms when lasers from a magneto-optical trap and an additional catalyst laser are present. We show that the near-degeneracy of the excited Ca(P-1(1)) + Yb+(S-2) and Ca+(S-2) + Yb(D-3(2)) asymptotic limits leads to large charge-transfer rate coefficients that can be controlled by changing the frequency of the catalyst laser and the ion temperature. Our model agrees with experimental rate-coefficient measurements between 50 mK and 1 K, with and without the catalyst laser, using just a single free parameter.