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Excitation of X-ray plasma satellites in a femtosecond laser-produced plasma

Faenov, A. Ya.; Gavrilenko, V. P.*; Magunov, A. I.*; Pikuz, T. A.*; Skobelev, I. Yu.*; Gasilov, S. V.*; Stagira, S.*; Calegari, F.*; Vozzi, C.*; Nisoli, M.*; Sansone, G.*; De Silvestri, S.*; Poletto, L.*; Villoresi, P.*

The excitation of X-ray plasma satellites was investigated in the plasma created by subpicosecond laser pulses with various intensities. It is shown that when laser flux density is greater 6$$times$$10$$^{16}$$ W/cm$$^{2}$$ strong oscillating electrical fields with $$Omega$$$$sim$$ (1.5-1.6)$$times$$10$$^{15}$$ s$$^{-1}$$ are excited in the plasma. These oscillations lead to modifications of profiles of X-ray spectral lines observed.

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