Controlling chemical reactions of a single particle
Controlling chemical reactions of a single particle
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DOI：
10.1038/nphys2373
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发表时间：
2012-09-01
期刊：
影响因子：
19.6
通讯作者：
Koehl, Michael
中科院分区：
文献类型：
--
作者：
Ratschbacher, Lothar;Zipkes, Christoph;Koehl, Michael
传统上，化学反应是通过调节热力学参数来研究的，例如温度或压力。最近，激光(1)或磁场(2)控制方法的出现提供了新的实验可能性，特别是在冷碰撞领域。反应路径的控制也是实现分子量子信息处理的关键组成部分(3)。对于这些研究，单个粒子提供了一个干净和可控的实验系统。在这里，我们报道了通过控制单个囚禁离子和超冷中性原子的量子态来调节它们的交换反应速率的实验。我们观察了超精细相互作用对化学反应速率和支化比的影响，并监测了反应产物的运动学。这些研究推动了单粒子捕获的化学朝着实现化学反应的量子限制控制的方向发展，并指出了单离子钟缓冲气体冷却的限制。
Traditionally, chemical reactions have been investigated by tuning thermodynamic parameters, such as temperature or pressure. More recently, laser(1) or magnetic field(2) control methods have emerged to provide new experimental possibilities, in particular in the realm of cold collisions. The control of reaction pathways is also a critical component to implement molecular quantum information processing(3). For these studies, single particles provide a clean and well-controlled experimental system. Here, we report on the experimental tuning of the exchange reaction rates of a single trapped ion with ultracold neutral atoms by exerting control over both their quantum states. We observe the influence of the hyperfine interaction on chemical reaction rates and branching ratios, and monitor the kinematics of the reaction products. These investigations advance chemistry with single trapped particles towards achieving quantum-limited control of chemical reactions and indicate limits for buffer-gas cooling of single-ion clocks.