After ultrafast laser irradiation, a target enters a poorly explored regime where physics of a solid state overlaps with plasma physics and chemistry, creating an unusual synergy-a warm dense matter state (WDM). We study theoretically the WDM kinetics and chemistry in a number of group III-metal oxides with highly excited electronic system. We employ density functional theory to investigate a possibility of nonthermal transition of the materials into a superionic state under these conditions. Atomic and electronic properties of the materials are analyzed during the transitions to acquire insights into physical mechanisms guiding such transformations.

Institute of Physics Czech Academy of Sciences Na Slovance 2 182 21 Prague 8 Czech Republic

Institute of Plasma Physics Czech Academy of Sciences Za Slovankou 3 182 00 Prague 8 Czech Republic

P N Lebedev Physical Institute of the Russian Academy of Sciences Leninskij pr 53 119991 Moscow Russia

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Damage Mechanisms in Polyalkenes Irradiated with Ultrashort XUV/X-Ray Laser Pulses