laser辐照液氢膨胀微等离子体中巴耳末谱的出现
On the occurrence of Balmer spectra in expanding microplasmas from laser irradiated liquid hydrogen
摘要：
研究了超短强激光脉冲辐照氢液滴的巴耳末谱。氢谱线的韧致辐射、斯塔克展宽和范德华轮廓的统一量子统计描述被使用，这允许包括多粒子效应。分析谱线轮廓，推断出稠密等离子体的低电离度，其中对谱线形状的主要贡献来自与中性组分的相互作用。推导了辐射微等离子体的有效温度和有效密度。等离子体流体力学内的动力学描述，解释激发原子态的形成在膨胀系统和所观察到的巴耳末线的发生只有低于临界密度。
英文摘要：
Balmer spectra are investigated which are obtained from hydrogen droplets irradiated by ultra-short intense laser pulses. A unified quantum statistical description of bremsstrahlung, the Stark broadening and the van der Waals profile of hydrogen spectral lines is used, which allows to include many-particle effects. Analyzing the line profiles, a low ionization degree of a dense plasma is inferred, where the main contribution to the spectral line shape originates from the interaction with the neutral components. Effective temperatures and densities of the radiating microplasma are deduced. A dynamical description is given within plasma hydrodynamics, explaining the formation of excited atomic states in the expanding system and the occurrence of the observed Balmer lines only below a critical density.
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