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射线光谱学研究基本的电子相关驱动过程，如自电离和俄歇衰变。同时，我们还研究了用种子粒子加速器产生阿秒脉冲序列的方法，以提高粒子加速器的时间分辨实验能力。该项目将基于在feels （FERMI和EuXFEL）或使用桌面高次谐波源进行的实验之间的密切合作，以及在feels模拟非线性XUV和x射线过程以及重建阿秒波形的理论发展。弗莱堡大学的小组将负责项目的实验部分，而罗蒙诺索夫大学的小组将进行项目中使用的理论和重建工具的开发。两位首席研究员（Giuseppe Sansone教授和Alexei Grum-Grzhimailo教授）之间的良好沟通与合作，从共同出版物的记录和在过去六年中进行的几次相关交流和互访中得到了证明。

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.