Institut für Experimentalphysik and Zentrum für Quantenphysik, Universität Innsbruck, 6020 Innsbruck, Austria.
Phys Rev Lett. 2010 Feb 5;104(5):053201. doi: 10.1103/PhysRevLett.104.053201. Epub 2010 Feb 1.
We report on the observation of an elementary exchange process in an optically trapped ultracold sample of atoms and Feshbach molecules. We can magnetically control the energetic nature of the process and tune it from endoergic to exoergic, enabling the observation of a pronounced threshold behavior. In contrast to relaxation to more deeply bound molecular states, the exchange process does not lead to trap loss. We find excellent agreement between our experimental observations and calculations based on the solutions of three-body Schrödinger equation in the adiabatic hyperspherical representation. The high efficiency of the exchange process is explained by the halo character of both the initial and final molecular states.
我们报告了在光学俘获的超冷原子和 Feshbach 分子样品中观察到的基本交换过程。我们可以通过磁场控制该过程的能量性质，并将其从吸能调谐为放能，从而观察到明显的阈值行为。与弛豫到更深的束缚分子态不同，交换过程不会导致陷阱损失。我们发现，我们的实验观察结果与基于三体薛定谔方程在绝热超球坐标中的解的计算结果非常吻合。交换过程的高效率可以用初始和最终分子态的晕特性来解释。
