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首页> 外文期刊>Journal of Experimental and Theoretical Physics >Plasma satellites of X-ray lines of ions in a picosecond laser plasma
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Plasma satellites of X-ray lines of ions in a picosecond laser plasma

机译：皮秒激光等离子体中离子X射线线的等离子卫星

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摘要

We present the results of our measurements of the spectra for multicharged ions in a plasma produced by moderately intense (about 10(17) W cm(-2)) picosecond laser pulses. They suggest the existence of intense plasma oscillations with a frequency appreciably lower than the frequency of the laser radiation. The observed spectrum for the plasma satellites of the Lyman Ly(alpha) doublet of the hydrogenic F IX ion in a dense plasma was modeled theoretically. The resulting doublet profile was shown to have a complex structure that depends nontrivially both on the plasma density and on the frequency and amplitude of the plasma oscillations. The positions of the satellites and their separations allowed them to be associated with intense electrostatic oscillations with an amplitude of (4-6) x 10(8) V cm(-1) and a frequency near (0.7-1) x 10(15) s(-1). Assuming the oscillation frequency to be determined by the strength of the magnetic field B generated in the plasma, we obtained an estimate of B that is in reasonable agreement with other measurements and estimates of this quantity. Our theoretical analysis allowed explanation of the emission spectra observed when flat fluoroplastic targets were heated by intense picosecond laser pulses. (C) 2004 MAIK "Nauka / Interperiodica".
机译：我们介绍了由中等强度（约10（17）W cm（-2））皮秒激光脉冲产生的等离子体中的多电荷离子的光谱测量结果。他们认为存在强烈的等离子体振荡，其频率明显低于激光辐射的频率。理论上模拟了稠密等离子体中氢F IX离子的LymanLyα双峰的等离子卫星的观测光谱。结果表明，所得的双峰分布具有复杂的结构，该结构不但取决于等离子体密度，还取决于等离子体振荡的频率和幅度。卫星的位置及其间隔使它们与振幅为（4-6）x 10（8）V cm（-1）且频率接近（0.7-1）x 10（15）的强烈静电振荡相关联）s（-1）。假设振荡频率由等离子体中产生的磁场B的强度确定，我们获得的B估计值与其他测量值和该数量的估计值在合理范围内一致。我们的理论分析可以解释当用强烈的皮秒激光脉冲加热扁平的氟塑料靶时观察到的发射光谱。 （C）2004 MAIK“ Nauka / Interperiodica”。

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