类氢氖在高温高密度等离子体中的光谱漂移  

Spectral line shifts of H-like neon in hot and dense plasmas

作　　者：张丽[1] 李向东[1] 

机构地区：[1]中国科学院上海光学精密机械研究所强场激光物理国家重点实验室

出　　处：《强激光与粒子束》2006年第5期779-784,共6页High Power Laser and Particle Beams

基　　金：国家自然科学基金资助课题(10274089)

摘　　要：采用离子球模型,通过自洽求解Poisson方程和Dirac方程,得到氖的类氢离子低能级组态的能级能量随等离子体电子温度和电子密度的变化关系,进一步研究了等离子体电子温度和电子密度对光谱漂移的影响。结果表明:光谱漂移随着等离子体电子密度的增大而增大,随着电子温度的升高而减小;谱线精细结构分裂随着电子密度的增大而减小,随着电子温度的升高而增大。等离子体对束缚电子的屏蔽是决定光谱漂移的主要原因。这些变化规律不仅对等离子体光谱模拟结果产生影响,而且使实验上观测光谱的相对或绝对漂移成为可能,从而为高密度等离子体诊断的新方法提供了理论依据。By supposing the ion sphere model, the self-consistent field method between the Poisson-Boltzmann equation and the Dirac equation is used to calculate the energy levels of H-like neon immersed in hot and dense plasmas. Consequently, the effects of the plasma on the bound energy levels, and on the transitions between ls and 2p electron configurations are studied. The results show that the spectral line shift increases with the increase of electron density, and decreases with the increase of electron temperature. The discrepancy of the fine spectral splitting decreases with the increase of electron density, and increases with the increase of electron temperature. All the variations will not only seriously affect the final spectrum simulations, but also make it possible to experimentally observe the relative or absolute shifts. Thus, measurement of the relative position of the fine structure splitting will become a potential new way in dense plasma diagnoses.

关 键 词：类氢离子 等离子体 光谱漂移 精细结构分裂 离子球模型 

分 类 号：O562.3[理学—原子与分子物理]