State-resolved scattering of anions with neutral molecules in combination with strong laser fields, studied with velocity map imaging

研究了少体系统中电荷转移的量子态操纵，目的是控制中间碰撞连续体中的量子动力学，从而引导碰撞结果。主要焦点在于离子-原子和离子-分子在低相对能量下碰撞的小型原型系统中的电荷转移。最先进的激光操作和冷却技术的应用可以作为一种工具，在明确定义的内部和运动状态下提供碰撞伙伴。我们的实验集中在两个方向上，由两个互补的子项目来代表。在子项目A中，使用COLTRIMS以运动学完整的方式研究了磁光阱中两种稳定铷同位素的电荷转移和电离。目标原子要么与从新型超冷激光离子源中提取的铷离子束相互作用，要么与强飞秒激光脉冲相互作用。后者的实验旨在铷的多重光电离是在与Teilprojekt E3合作进行的。子项目B研究了在强激光场中排列的分子与反应离子碰撞时的电荷转移和量子动力学。冷离子从缓冲气体冷却的射频阱中提取，而分子在超音速射流膨胀中冷却。研究了激光辅助碰撞的立体动力学效应以及电磁场对碰撞动力学的直接耦合。

Quantum state manipulation of charge transfer in few-body systems is investigated with the goal to control the quantum dynamics in the intermediate collision continuum and thereby steer the outcome of the collision. The main focus lies on charge transfer in small prototype systems for ion-atom and ion-molecule collisions at low relative energies. The application of state-of-the-art laser manipulation and cooling techniques serves as a tool to provide collision partners at well-defined internal and motional states. Our experiments are focused towards two directions, represented by two complementary subprojects. In Subproject A, charge transfer and ionization of the two stable rubidium isotopes in a magneto-optical trap is investigated in a kinematically complete way using COLTRIMS. The target atoms interact either with bunches of rubidium ions extracted from a novel ultracold laser ion source, or with strong femtosecond laser pulses. The latter experiment aiming at multiple photoionisation of rubidium is performed in a collaboration with Teilprojekt E3. In Subproject B, charge transfer and quantum dynamics in reactive ion collisions with molecules which are aligned in a strong laser field are studied. The cold ions are extracted from a buffer-gas cooled RF trap, while the molecules are cooled in a supersonic jet expansion. Stereodynamical effects as well as direct coupling of the electromagnetic field to the collision dynamics in this laser-assisted collision is investigated.