Ultracold high precision ion sources

该研究项目的目的是在磁光阱中超冷原子光致电离的基础上实现高精度离子源并确定其特性。这种离子源受益于极小的横向能量扩散。目前，性能受到离子之间的随机库仑相互作用和离子光学器件的球面像差的限制。此外，目前报道的设计不允许源的确定性操作，即。e.精确控制产生的离子数量。这对半导体掺杂的未来应用具有特别重要的意义。借助合适的电离过程和检测方案，现有的方法将被扩展以克服这些限制。这是通过在致密原子气体中所谓的里德伯阻塞和在离子产生的瞬间实验性地触发离子光学的电场来实现的。以这种方式，可以影响束中离子的时间序列，并且可以减少随机库仑相互作用。此外，也可以操纵单个离子轨迹。最终，电离事件的检测也允许源的确定性操作。有了高精度的确定性离子源，基础研究中的新实验（如离子干涉测量）以及固体和表面的新光谱和显微镜研究成为可能。

The research project aims at the realization and characterization of high precision ion sources on the basis of photoionization of ultracold atoms in a magneto-optical trap. Such ion sources benefit from an extremely small transversal energy spread. Currently, the performance is limited by stochastic Coulomb interaction between the ions and spherical aberrations of the ion optics. Moreover, the currently reported designs do not allow for the deterministic operation of the source, i. e. the exact control over the number of created ions. This is of special importance for possible future applications in semiconductor doping.With help of suitable ionization processes and detection schemes, the existing methodology will be extended to overcome these limitations. This achieved by means of the so called Rydberg blockade in dense atomic gases and the experimental trigger of the electric fields of the ion optics on the moment of creation of the ion. In this way, the temporal sequence of the ions in the beam can be influenced and the stochastic Coulomb-interaction can be reduced. Moreover, the individual ion trajectory can be manipulated as well. Eventually, the detection of the ionization event also allows for the deterministic operation of the source.Having a high precision deterministic ion source at hand, new experiments in fundamental research such as ion interferometry as well as new spectroscopic and microscopic studies of solids and surfaces become possible.