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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We would like to thank all the people who have been collaborating with us on the topics discussed in this article. Particularly, our thanks go to Nora Berrah, Philip Bucksbaum, Louis DiMauro, Gilles Doumy, Robert Dunford, Elliot Kanter, Bertold Krässig, Nina Rohringer, Daniel Rolles, Artem Rudenko, Sang-Kil Son, Stephen Southworth, Kiyoshi Ueda, and Joachim Ullrich.
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Santra, R., Young, L. (2015). Interaction of Intense X-Ray Beams with Atoms. In: Jaeschke, E., Khan, S., Schneider, J., Hastings, J. (eds) Synchrotron Light Sources and Free-Electron Lasers. Springer, Cham. https://doi.org/10.1007/978-3-319-04507-8_25-1
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