  This proceeding discusses the impact of XUV/X-ray irradiation on materials,
and how their response is affected by temperature, size, and structure. When
materials are exposed to intense XUV/X-ray irradiation, they undergo a series
of processes ultimately leading to observable structure modification and
damage. These effects were studied with a hybrid simulation tool XTANT-3. The
code combines several methods in one interconnected model: the photon
absorption and electron cascades are simulated with transport Monte Carlo;
nonequilibrium kinetics of slow electrons (in the valence and the bottom of the
conduction band) is traced with the Boltzmann equation; modeling evolution of
the electronic structure and interatomic potential is done with the
transferable tight binding method; and the response of the atomic system is
simulated with the molecular dynamics. Combining these methods enabled the
tracing of the essential effects of irradiation. This brief review summarizes
the recent results obtained with this simulation tool.
