Advances in Atomic and Molecular Physics research with XUV Radiation Sources at the Elettra Laboratory.

A detailed knowledge of the electronic structure of matter must be built upon understanding of spectroscopy and dynamics in isolated system. Following Ugo Fano's lesson, our Research group has been serving the atomic-, molecular-, and cluster-physics community at the Elettra synchrotron radiation laboratory (Trieste, I) for almost two decades [1], enabling thorough spectroscopical studies of isolated system by means of photoionization techniques and inner-shell electron photoionization, even with low density targets such as molecular vapours [2] or clusters [3]. More recently the interest of the physical chemistry-chemical physics community has been attracted by the opportunity of exploring the temporal dynamics of isolated systems by means of novel fs-XUV light sources, such as the FERMI free electron laser [4, 5] and the CITIUS laser high harmonic generation source [6]. I will outline research opportunities opened in this field at Elettra. In particular I will discuss recent experiments, which on one side are useful for characterizing our XUV light sources [5, 7] and on the other side are also paving the way for thorough investigations of non linear processes and excited state dynamics [8]. References 1. K.C. Prince, et al, J. Synch. Rad. 5 (1998) 565 2. M. Coreno, et al, Dalton Trans. 43, 5134 (2014). 3. T. Mazza, M. Devetta, P. Milani, G. Bongiorno, M. Coreno, P. Piseri, New J. Phys. 13, 023009 (2011). 4. C. Svetina, C. Grazioli, et al. J. Synch. Rad. 22, 538 (2015) . 5. T. Mazza, et al. Nature Communications 5, art. n. 3648 (2014). 6. C. Grazioli, et al. , Rev. Sci. Instr. 85, 23104 (2014). 7. E. Allaria, et al. Phys. Rev. X 4, 41040 (2014). 8. M. ?itnik et al., Phys. Rev. Lett. 113, 193201 (2014)