Single- and double-core-hole ion emission spectroscopy of transient neon plasmas produced by ultraintense x-ray laser pulses
Single- and double-core-hole ion emission spectroscopy of transient neon plasmas produced by ultraintense x-ray laser pulses
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超强 X 射线激光脉冲产生的瞬态氖等离子体的单核和双核离子发射光谱
DOI：
10.1088/0953-4075/49/4/044001
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发表时间：
2016-01
期刊：
影响因子：
--
通讯作者：
曾交龙
中科院分区：
文献类型：
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作者：
曾交龙
系统地研究了氖与光子能量为937 eV至2000 eV的超强X射线脉冲相互作用时的单芯空穴（SCH）和双芯空穴（DCH）光谱。本文采用含时速率方程，在详细能级近似下，研究了激光产生的高瞬态等离子体的能级布居和发射特性的动力学演化。等离子体密度对能级布居和电荷态分布的影响表明与2000 eV的X射线光子能量。结果表明，相关实验的原子序数密度约为1 × 1018 cm−3，这与最近的一个实验相当。在这个密度下，我们系统地研究了瞬态氖等离子体的发射率。在937-1360 eV的激光光子能量范围内，1 s → np？>（n ≥？> 2)跃迁在布居和DCH发射光谱的时间演化中起重要作用。RA效应的详细说明为944 eV的光子能量的X射线脉冲，它创建的1 s → 2 p？> RA从SCH状态（1 s 2 s 2 2 p 4？1 s2 s2 p5和1 s2 p6）。在对X射线脉冲的空间和时间分布进行平均后，研究了在X射线光子能量为937、944、955、968、980和990 eV的情况下的DCH发射谱，其中存在1 s → 2 p？>从Ne 2 +-Ne 7+的SCH态的共振。讨论了DCH态的产生过程。当X射线光子能量大于1360 eV时，不存在RA，瞬态等离子体在DCH谱中表现出不同的特征。
Single-core-hole (SCH) and double-core-hole (DCH) spectroscopy is investigated systematically for neon gas in the interaction with ultraintense x-ray pulses with photon energy from 937 eV to 2000 eV. A time-dependent rate equation, implemented in detailed level accounting approximation, is utilized to study the dynamical evolution of the level population and emission properties of the laser-produced highly transient plasmas. The plasma-density effects on level populations and charge-state distribution are demonstrated with an x-ray photon energy of 2000 eV. It is shown that atomic number density of relevant experiment is about 1 × 1018 cm−3, which is comparable to a recent experiment. At this density, we systematically investigate the emissivity of the transient neon plasmas. For laser photon energy in the range 937–1360 eV, resonant absorptions (RA) of 1 s → np ?> ( n ≥ ?> 2) transitions play important roles in time evolution of the population and DCH emission spectroscopy. The RA effects are illustrated in detail for an x-ray pulse of 944 eV photon energy, which creates the 1 s → 2 p ?> RA from the SCH states ( 1 s 2 s 2 2 p 4 ?> , 1s2s2p5, and 1s2p6) of Ne3+. After averaging over the space and time distribution of x-ray pulse, DCH emission spectroscopy is studied at x-ray photon energies of 937, 944, 955, 968, 980, and 990 eV, where there exist 1 s → 2 p ?> resonances from SCH states of Ne2+-Ne7+. The processes with producing DCH states are discussed. For x-ray photon energy larger than 1360 eV, no RA exist and transient plasmas show different features in the DCH spectroscopy.