Interaction of ultrashort laser pulses with materials can bring the latter to highly non-equilibrium states, where the electronic temperature strongly differs from the ionic one. The properties of such excited material can be considerably different from those in a hot, but equilibrium state. The reliable modeling of laser-irradiated target requires careful analysis of its properties in both regimes. This paper reports a procedure which provides the equations of state of ruthenium using density functional theory calculations. The obtained data are fitted with analytical functions. The constructed equations of state are applicable in the one- and two-temperature regimes and in a wide range of densities, temperatures and pressures. The electron thermal conductivity and electron-phonon coupling factor are also calculated. The obtained analytical expressions can be used in two-temperature hydrodynamics modeling of Ru targets pumped by ultrashort laser pulses. The data is related to the research article "Similarity in ruthenium damage induced by photons with different energies: From visible light to hard X-rays" [1].

Center for Free Electron Laser Science CFEL Deutsches Elektronen Synchrotron DESY Notkestrasse 85 22607 Hamburg Germany

Dukhov Research Institute of Automatics Sushchevskaya 22 Moscow 127055 Russia

Industrial Focus Group XUV Optics MESA Institute for Nanotechnology University of Twente Drienerlolaan 5 7522 NB Enschede the Netherlands

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

Joint Institute for High Temperatures Russian Academy of Sciences Izhorskaya 13 Bldg 2 Moscow 125412 Russia

Landau Institute for Theoretical Physics Russian Academy of Sciences Chernogolovka 142432 Russia

Moscow Institute of Physics and Technology Institutskiy Pereulok 9 Dolgoprudny Moscow Region 141700 Russia

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