Nonlinear spectroscopy and attosecond metrology by new generation XUV and X-ray sources

该项目旨在通过非线性XUV和X射线光谱研究基本的电子相关驱动过程，如自电离和俄歇衰变。同时，我们的目标是通过研究种子自由电子激光产生阿秒脉冲串来提高自由电子激光时间分辨实验的能力（FERMI和EuXFEL）或使用桌面高次谐波发生源，和非线性XUV和X射线过程的模拟和自由电子激光阿秒波形的重建的理论发展。弗赖堡大学的小组将负责该项目的实验部分，而罗蒙诺索夫大学的小组将开发该项目中使用的理论和重建工具。两位主要研究者（Giuseppe Sansone教授和Alexei Grum-Grzhimailo教授）之间的良好沟通与合作程度得到了共同出版物记录以及过去六年中多次相关交流和互访的证明。

This project aims at investigating fundamental electronic-correlation driven processes such autoionisation and Auger decay by nonlinear XUV and X-ray spectroscopy. At the same time we aim at advancing the capability of time-resolved experiment at FELs, by investigating the generation of trains of attosecond pulses by seeded FELs.The project will be based on a close collaboration between experiments performed at FELs (FERMI adn EuXFEL) or using table-top high-order harmonic generation sources, and theoretical developments for the simulation of nonlinear XUV and X-ray processes and for the reconstruction of attosecond waveforms at FELs. The group at the university of Freiburg will be responsible for the experimental part of the project, while the group at the Lomonosov University will carry out the development of the theoretical and reconstruction tools used in the project. The excellent degree of communication and cooperation between the two Principal Investigators (Prof. Giuseppe Sansone and Prof. Alexei Grum-Grzhimailo) is certified by the track of record of common publications and by the several relative exchange and reciprocal visits during the last six years.