Interaction of Intense X-Ray Beams with Atoms

Santra, Robin; Young, Linda

doi:10.1007/978-3-319-14394-1_25

Contribution to a book

PUBDB-2016-02575

Interaction of Intense X-Ray Beams with Atoms

Santra, R. (Corresponding author)CFEL*DESY* ; Young, L.

2016
Springer International Publishing Cham

Synchrotron Light Sources and Free-Electron Lasers / Jaeschke, Eberhard J. (Editor) ; Cham : Springer International Publishing, 2016, Chapter 25 ; ISBN: 978-3-319-14393-4 Cham : Springer International Publishing 1233-1260 (2016) [10.1007/978-3-319-14394-1_25]

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Please use a persistent id in citations: doi:10.1007/978-3-319-14394-1_25

Abstract: 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.

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