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Time-resolved ionization measurements with intense ultrashort XUV and X-ray free-electron laser pulses

  • Victor Tkachenko (a1) (a2), Martin Büscher (a1), Hauke Höppner (a1) (a3), Nikita Medvedev (a4) (a5), Vladimir Lipp (a2), Giulio Maria Rossi (a2), Flavio Capotondi (a6), Paola Finetti (a6), Emanuele Pedersoli (a6), Ivaylo Nikolov (a6), Mitcho Danailov (a6), Luca Giannessi (a6), Mark J. Prandolini (a7), Sven Toleikis (a8), Katalin Mecseki (a9), Matthew Windeler (a9), Beata Ziaja (a2) (a10), Franz Tavella (a9) and Ulrich Teubner (a1) (a11)...

Abstract

Modern free-electron lasers (FEL) operating in XUV (extreme ultraviolet) or X-ray range allow an access to novel research areas. An example is the ultrafast ionization of a solid by an intense femtosecond FEL pulse in XUV which consequently leads to a change of the complex index of refraction on an ultrashort timescale. The photoionization and subsequent impact ionization resulting in electronic and atomic dynamics are modeled with our hybrid code XTANT(X-ray thermal and non-thermal transitions) and a Monte Carlo code XCASCADE(X-ray-induced electron cascades). The simulations predict the temporal kinetics of FEL-induced electron cascades and thus yield temporally and spatially resolved information on the induced changes of the optical properties. In a series of experiments at FERMI and LCLS, single shot measurements with spatio-temporal encoding of the ionization process have been performed by a correlation of the FEL pump pulse with an optical femtosecond probe pulse. An excellent agreement between the experiment and the simulation has been found. We also show that such kind of experiments forms the basis for pulse duration and arrival time jitter monitoring as currently under development for XUV-FELs.

Copyright

Corresponding author

Author for correspondence: Victor Tkachenko, Institute for Laser and Optics (ILO), Hochschule Emden/Leer – University of Applied Sciences, Constantiaplatz 4, 26723 Emden, Germany and Center for Free-Electron Laser Science CFEL, Deutsches Elektronen-Synchrotron DESY, Notkestrasse 85, 22607 Hamburg, Germany. E-mail: victor.tkachenko@desy.de; Ulrich Teubner, Institute for Laser and Optics (ILO), Hochschule Emden/Leer – University of Applied Sciences, Constantiaplatz 4, 26723 Emden, Germany and Institute of Physics, Carl von Ossietzky University, Carl-von-Ossietzky-Str. 9-11, 26111 Oldenburg, Germany. E-mail: ulrich.teubner@hs-emden-leer.de

References

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Keywords

Time-resolved ionization measurements with intense ultrashort XUV and X-ray free-electron laser pulses

  • Victor Tkachenko (a1) (a2), Martin Büscher (a1), Hauke Höppner (a1) (a3), Nikita Medvedev (a4) (a5), Vladimir Lipp (a2), Giulio Maria Rossi (a2), Flavio Capotondi (a6), Paola Finetti (a6), Emanuele Pedersoli (a6), Ivaylo Nikolov (a6), Mitcho Danailov (a6), Luca Giannessi (a6), Mark J. Prandolini (a7), Sven Toleikis (a8), Katalin Mecseki (a9), Matthew Windeler (a9), Beata Ziaja (a2) (a10), Franz Tavella (a9) and Ulrich Teubner (a1) (a11)...

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