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• The electron correlation model was constructed for double K hole states of highly charged Xe q + ions. • The multi-configuration Dirac-Hartree-Fock method was used with electron correlation, Breit and QED effects corrections. • The spectator electron effects on the transition energy shift was determined to be 240 eV per 2p spectator electron. • The synthetic spectrum of the bare Xe ions interacting with carbon target were provided. The double electron E1 transition energies, probabilities, and oscillator strengths between the 2 s 2 p n and 1 s 2 2 p n − 1 (1 ≤ n ≤ 6) configurations of Xe q + (47 ≤ q ≤ 52) ions with different spectator electrons have been calculated based on the multi-configuration Dirac-Hartree-Fock method. A reasonable electron correlation model is constructed with the aid of the active space method. The finite mass of nuclear, Breit interaction and QED effects have also been included. The calculated results are in good agreement with the available data. The theoretical spectra of different spectator electrons of the double K hole state have been predicted. The spectator electron effects on the transition spectra have been analyzed in detail. The present results will be helpful for analyzing the high energy X-ray spectrum observed from the interaction between high energy highly charged ions and the surface. [ABSTRACT FROM AUTHOR]

• A systematic study of spatiotemporal evolution of extreme ultraviolet spectra in laser-produced silver (Ag) plasmas is performed with aid of a spatio-temporally resolved emission spectroscopy and multiconfiguration Hartree-Fock calculations. • Complex spectral structures were accurately revealed based on the assumption of a normalized Boltzmann distribution among the excited states and a steady-state collision-radiative model, which are dominated from the contributions of 4p and 4d excitations of Ag7+–Ag13+ ions. • Theoretical plasma-state parameters near the target surface at the initial stage of the laser-produced Ag plasma were determined via the steady-state collision-radiation model. Experimental and theoretical analyses are reported for the spatiotemporal evolution of extreme ultraviolet spectra in laser-produced silver (Ag) plasmas. The time-resolved spectra were acquired 1.5 mm from the target surface. The 4p and 4d excitations of Ag7+–Ag13+ ions were calculated with the aid of multiconfiguration Hartree-Fock calculations. The spectral line distributions of transitions in the dominant 4p and 4d excitation configurations and their variations with the degree of ionization were analyzed. Complex spectral structures were accurately revealed based on the assumption of a normalized Boltzmann distribution among the excited states and a steady-state collision-radiative model. Experimental peak origins were identified by comparing experimental and simulated spectra. These results will provide data for energy-level structures of highly-charged ions of middle- and high-Z elements and their radiative characteristics in plasmas. [ABSTRACT FROM AUTHOR]