Abstract
Theoretically predicted red shifts of the Cu Kα emission from partly populated M-shell ionic states have been studied in experiments performed at the LULI2000 kJ-ns laser facility. The X-ray spectra were recorded by using three spherically bent crystal spectrometers providing a very high spatial (δx ≈ 7 µm) and spectral (λ/Δλ ≈ 3100) resolution. The spatially resolved profiles of Kα lines are characterized by red shifts due to a strong overlap of X-ray lines emitted from low charge states at the initial phase of the laser-matter interaction.Detailed theoretical interpretation of the spectra based on multi-configuration Hartree–Fock simulations provided the population factors of each charge state of 3 s and 3p subshells. The advanced diagnostic presented here provides a vehicle for studying the hot and/or dense plasmas in transient environments and gives important information about hot electrons induced X-ray line emission.
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