Silvia Mauri
(MAX IV Laboratory, Lund University)

Abstract:
This introductive lecture will firstly provide an overview on how the interaction between X-Rays and matter can be exploited to study different materials properties. The presentation will be focused on the physical principles ruling X-Ray Absorption and Photoemission processes: X-Ray Absorption Spectroscopy (XAS)¹ and X-Ray Photoemission Spectroscopy (XPS)² are indeed nowadays fundamental techniques largely employed to investigate the electronic structure of atoms, providing essential information about the local chemical environment of single chemical species. Starting from the basic theoretical background ruling these processes, we will then go through experimental details, highlighting the fundamental role of powerful X-Ray sources such as Synchrotron Radiation. Experiments conducted at ambient conditions will be here introduced, emphasizing the advantages with respect to conventional Ultra High Vacuum (UHV) - based ex-situ experiments. Finally, few examples of XPS and XAS data interpretation at different complexity level will be provided, with a focus on the importance of theoretical spectra simulations as a powerful tool to obtain deeper understanding of the experimental results.
 
¹J. Stöhr, NEXAFS Spectroscopy, Springer-Verlag Berlin Heidelberg 1992.
²J.F. Moulder and J. Chastain. Handbook of X-ray Photoelectron Spectroscopy: A Reference Book of Standard Spectra for Identification and Interpretation of XPS Data. Physical Electronics Division, Perkin-Elmer Corporation 1992.

 

Zoom registration link:

https://zoom.us/meeting/register/aLZ3K_6-SxedYpbmeBkQ6A