Fig. 1: Atomic simulation of plasma opacity and X-ray emission spectra.
a Optical depth of a solid Cu plasma with 10 μm thickness at different temperatures calculated by the atomic code SCFLY over a broad photon energy range covering bound-bound and bound-free transitions for the hot dense plasma. Each peak corresponds to a specific K-L bound-bound transition of the Cu ions. b Temperature dependence of Cu’s optical depth at the resonant photon energy of Ephoton = 8.2 keV, along with its corresponding averaged charge state. c Comparison of simulated X-ray emission spectra with and without XFEL irradiation at a plasma temperature of 400 eV. The light blue shaded region denotes the full spectral bandwidth of the XFEL beam centered at 8.2 keV.
