High-Repetition-Rate Attosecond Source for Coincidence Spectroscopy

高重复率阿秒源对于弗莱堡大学物理系的阿秒和强场科学研究项目的发展至关重要。特别是，该源将使小量子系统上的符合光谱实验成为可能。阿秒源将用于驱动安装在弗莱堡大学新实验室的光电子/光离子重合光谱仪（反应显微镜）。重复率为几千赫的阿秒源不适合巧合光电子/光子光谱学，因为它们施加了极长的采集时间（长达几天甚至几周，这取决于特定实验的特征，如中心光子能量、目标密度、电离通道的数量、截面等），这挑战了实验装置的长期稳定性。一般来说，原子和分子中的符合光谱从高重复率源（≥50 kHz）的可用性中获益很大，这可以显着减少采集时间。利用本项目的设备，我们将研究小分子中的相关电子-核动力学和原子多色光离的阿秒时间延迟。这两个研究课题代表了阿秒科学领域的两个重要研究方向。

The High-Repetition Rate Attosecond Source will be crucial for the development of a research program in attosecond and strong field science at the Physics Department of the University of Freiburg. In particular, this source will enable coincidence spectroscopy experiments on small quantum systems. The Attosecond Source will be used to drive the photoelectron/photoion coincidence spectrometer (Reaction Microscope) that will be installed in the new laboratory at the University of Freiburg.Attosecond sources with a repetition-rate of a few kHz are not well-suited for coincidence photoelectron/photoion spectroscopy, because they impose extremely long acquisition times (up to several days and even weeks, depending on the characteristics of the specific experiment, such as central photon energy, density of the target, number of the ionization channels, cross-sections, etc.) that challenge the long-term stability of the experimental setup. In general, coincidence spectroscopy in atoms and molecules strongly benefits from the availability of high-repetition rate sources (≥50 kHz), which can significantly reduce the acquisition times. Using the equipment of this project, we will investigate correlated electron-nuclear dynamics in small molecules and attosecond time delays in the multi-color photoionization of atoms. Both research topics represent two important research directions in the field of attosecond science.