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

在这个项目中，将开发和应用激光产生的飞秒时间分辨率的硬x射线在表面和界面上的动态过程的研究方法。利用液体镓射流技术，实现了hn = 9.2517 keV （l = 1.34 Å）下重复频率为1 kHz的高亮度硬x射线源。产生的x射线将用环形弯曲的单晶布拉格镜收集。时间分辨光电子能谱将用于研究飞秒可见激光激发后金属层体系的磁耦合动力学。同时可以在相同的装置中进行衍射实验，并研究了最上层和埋藏层中晶格的动力学。与一个有机化学小组合作，将使用x射线衍射进行首次测试实验，以研究金属有机催化剂的运动动力学。

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.