Investigation of ultrafast structural changes of metallic layers and metallo-organic complexes by hard x-ray photoemission and diffraction

在本项目中，将开发和应用方法，通过具有飞秒时间分辨率的激光产生的硬x射线来研究表面和界面处的动态过程。将实现一个基于液体镓射流技术的高亮度硬X射线源，重复频率为1kHz，能量为hn = 9.2517keV（l = 1.34 keV）。产生的X射线将用环形弯曲的单晶布拉格反射镜收集。利用时间分辨光电子能谱技术研究了飞秒可见光激发下金属层状体系的磁耦合动力学。同时，衍射实验可以在相同的设置和晶格的最顶部和在埋层的动力学进行研究。与有机化学小组合作，将利用X射线衍射进行第一次测试实验，以研究金属有机催化剂中的运动动力学。

In this project methods shall be developed and applied for the investigation of dynamical processes at surfaces and interfaces by laser-generated hard x-rays with femtosecond time resolution. A high-brilliance hard x-ray source with 1 kHz repetition rate based on the liquid gallium jet technique at hn = 9.2517 keV (l = 1.34 Å) will be implemented. The generated x-rays will be collected with a toroidally bent single crystal Bragg mirror. Time-resolved photo-electron spectroscopy will be employed to study the dynamics of the magnetic coupling in metallic layer systems after femtosecond visible laser excitation. Simultaneously diffraction experiments can be performed in the same set-up and the dynamics of the lattice in the top most and in buried layers be studied. In cooperation with an organic chemistry group first test experiments to investigate the motional dynamics in metallo-organic catalysts will be conducted using x-ray diffraction.