%0 Book Section
%A Santra, Robin
%A Young, Linda
%T Interaction of Intense X-Ray Beams with Atoms
%C Cham
%I Springer International Publishing
%M PUBDB-2016-02575
%P 1233-1260
%D 2016
%< Synchrotron Light Sources and Free-Electron Lasers / Jaeschke, Eberhard J. (Editor)   ; Cham : Springer International Publishing, 2016, Chapter 25 ; ISBN: 978-3-319-14393-4
%X Generally, the probability that a given atom in a material absorbs an X-ray photon in a single X-ray pulse is much less than unity for storage-ring-based X-ray sources, even for third-generation synchrotron radiation sources. This situation has changed dramatically with the arrival of X-ray free-electron lasers: In the micro-focus of an X-ray free-electron laser, saturation of X-ray photoabsorption is routinely achieved. The immediate consequence is that the overall behavior of matter under such extreme conditions is characterized by efficient multiphoton absorption via a sequence of single-photon absorption events combined with inner-shell decay cascades and collisional ionization processes. In this way, unusual, highly excited states of matter are formed. Focusing on free atoms, this article provides a theoretical framework for the description of X-ray–matter interactions. The nature of X-ray multiphoton physics is explained, and the theory is compared with experimental data on atoms.
%F PUB:(DE-HGF)7
%9 Contribution to a book
%U <Go to ISI:>//WOS:00
%R 10.1007/978-3-319-14394-1_25
%U https://bib-pubdb1.desy.de/record/301141