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Using ab initio molecular-dynamics simulations combined with linear-responsetheory, we studied the x-ray absorption near-edge spectra (XANES) of atwo-temperature dense copper plasma. As the temperature increases, XANESspectra exhibit a pre-edge structure balanced by a reduction of the absorptionjust behind the edge. By performing systematic simulations for variousthermodynamic conditions, we establish a formulation to deduce the electronictemperature Te directly from the spectral integral of the pre-edge that can beused for various thermodynamic conditions encountered in a femtosecond heatingexperiment where thermal non equilibrium and expanded states have to beconsidered.

Understanding XANES spectra of two-temperature warm dense copper using ab initio simulation