• DOI:10.1038/nphys2373
• Corpus ID: 119206308

Controlling chemical reactions of a single particle

@article{Ratschbacher2012ControllingCR,
  title={Controlling chemical reactions of a single particle},
  author={Lothar Ratschbacher and Christoph Zipkes and Carlo Sias and Michael K{\"o}hl},
  journal={Nature Physics},
  year={2012},
  volume={8},
  pages={649 - 652}
}

• L. Ratschbacher, C. Zipkes, +1 author M. Köhl
• Published 20 June 2012
• Physics, Chemistry
• Nature Physics

Chemical reactions between a single trapped ion and a condensate of ultracold neutral atoms are investigated by controlling the quantum states of both ion and atoms—revealing the effect of the hyperfine interaction on the reaction dynamics. Traditionally, chemical reactions have been investigated by tuning thermodynamic parameters, such as temperature or pressure. More recently, laser1 or magnetic field2 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 processing3. 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.