Quantum-state controlled reactive scattering at tunable collision energy

可调碰撞能量下的量子态控制反应散射

• 批准号: 391945816
• 负责人: Dr. Katrin Dulitz
• 金额: --
• 依托单位: Institut für Ionenphysik und Angewandte Physik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2017
• 资助国家: 德国
• 起止时间: 2016-12-31 至 2021-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/391945816?language=en
• 关键词: Quantum; state; controlled; reactive; scattering

This project is aimed at studying reactive collisions between lithium atoms and metastable helium atoms (Penning and associative ionisation) at an unprecedented level of detail, with full quantum-state control of both reactants and at precisely tunable collision energies ranging from the thermal to the quantum regime. For this purpose, an existing setup composed of a supersonic, velocity-tunable metastable beam source and a magneto-optical trap for ultracold lithium atoms as a scattering target will be extended with components for electronic and magnetic quantum state control. To reach low collision energies, a cryogenic source for metastable helium atoms will be built and combined with an atomic beam decelerator. The experimental results obtained in this study will not only shed light on the influence of spin polarisation and quantum effects on the mechanism of this reaction but they will also challenge the current level of accuracy of ab initio quantum chemical calculations of potential energy surfaces and the associated quantum dynamics in an energy regime dominated by a few partial waves.

该项目旨在以前所未有的细节水平研究锂原子和亚稳态氦原子之间的反应性碰撞（潘宁和缔合电离），对两种反应物进行完全量子态控制，并精确地可调碰撞能量，范围从热到量子态。为此目的，现有的设置组成的超音速，速度可调的亚稳态光束源和磁光阱的超冷锂原子作为散射目标将扩展与电子和磁量子态控制的组件。为了达到低碰撞能量，将建立亚稳态氦原子的低温源，并与原子束减速器相结合。在这项研究中获得的实验结果不仅揭示了自旋极化和量子效应对该反应的机制的影响，但他们也将挑战目前的准确性水平的从头计算量子化学计算的势能面和相关的量子动力学的能量制度占主导地位的几个分波。