Plasma satellites of ion X-ray lines in picosecond laser plasma

The results of measuring the multicharged ion spectra in the plasma of the picosecond laser pulses of moderate intensity (about 1017W/cm2) testifying to the presence of the strong plasma oscillations with the frequency significantly lesser than the laser radiation frequency are presented. The observed plasma satellites spectrum of the Lyman Lyα doublet of the F IX hydrogen-like ion in the dense plasma is theoretically modulated. It is shown that the doublet resulting profile is characterized by the complex structure untrivially depending both on the plasma density and plasma oscillations frequency and amplitude. The satellites position and distance between them made it possible to relate them to the intensive electrostatic oscillations with the amplitude (4-6) x 108 V/cm and frequency close to (0.7-1) x 1015 s-1