The geometric phase controls ultracold chemistry.
The geometric phase controls ultracold chemistry.
复制标题
DOI：
10.1038/ncomms8918
复制
发表时间：
2015-07-30
影响因子：
16.6
通讯作者：
Balakrishnan N
中科院分区：
文献类型：
--
作者：
Kendrick BK;Hazra J;Balakrishnan N
几何相可以控制超冷化学反应的结果。控制是两个散射路径（直接和环路）之间干涉项的符号变化的直接结果，这有助于在圆锥相交（两个Born-Oppenheimer电子势能面之间的简并点）存在下的反应性碰撞过程。超冷能量状态的独特性质导致散射相移的有效量子化，从而在两个路径之间实现最大的建设性或破坏性干涉。以O+OH→H+O2反应为例，表明几何相的加入使超冷反应速率提高了近两个数量级。有趣的实验控制可能性包括外部电场和磁场的应用，可以用来利用这里报道的几何相位效应，并在实验上开关反应性。超冷反应可以让我们深入了解量子体系中的反应动力学。在这里，作者表明几何相可以对超冷反应产生巨大的影响，在所研究的反应中，可以提高或抑制近两个数量级的速率。
The geometric phase is shown to control the outcome of an ultracold chemical reaction. The control is a direct consequence of the sign change on the interference term between two scattering pathways (direct and looping), which contribute to the reactive collision process in the presence of a conical intersection (point of degeneracy between two Born–Oppenheimer electronic potential energy surfaces). The unique properties of the ultracold energy regime lead to an effective quantization of the scattering phase shift enabling maximum constructive or destructive interference between the two pathways. By taking the O+OH→H+O2 reaction as an illustrative example, it is shown that inclusion of the geometric phase modifies ultracold reaction rates by nearly two orders of magnitude. Interesting experimental control possibilities include the application of external electric and magnetic fields that might be used to exploit the geometric phase effect reported here and experimentally switch on or off the reactivity. Ultracold reactions can give insights into reactions dynamics in the quantum regime. Here, the authors show that the geometric phase can have a dramatic effect on ultracold reactions, enhancing or suppressing rates by nearly two orders of magnitude in the reaction studied.