等离子体效应对类氦氖Kα线系电偶极辐射的影响  

Plasma effect on the Kα group emission of He-like neon

作　　者：张丽[1,2] 李向东[1] 蒋新革[3] 

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 [2]中国科学院研究生院,北京100049 [3]伊犁师范学院物理与电子信息学院

出　　处：《物理学报》2006年第9期4501-4505,共5页Acta Physica Sinica

基　　金：国家自然科学基金(资助号:10274089)资助的课题.~~

摘　　要：采用离子球模型,通过自洽求解Boltzmann方程和Poisson方程,得到类氦氖离子Kα线系的两条电偶极辐射光谱能量随等离子体环境的漂移.结果显示,Kα线系电偶极谱线随等离子体电子密度增大发生红移,红移量与等离子体电子密度有近似的正比关系;随着等离子体电子温度的降低,光谱红移对等离子体电子密度的敏感性增大.另外,所研究的两条谱线间的能量间隔随等离子体电子密度的增大而减小,减小量随等离子体电子密度的变化也呈现出近似的线性规律.值得注意的是,类氦氖Kα线系中两条电偶极谱线分别为互组合线与共振谱线,而其能量差就是1s2p(3P1)的交换能,因此进一步发现能级中交换能将随等离子体环境变化的规律.所观察到的光谱红移和精细结构分裂在高密度等离子体中都有明显的变化,对探索高密度等离子体的诊断新方法有重要意义.The spectra shifts for the intercombination line （ 1s2p（3^ P1 ）→1 s^2 ） and the resonance line （ 1s2p（ 1^ P1 ） → 1 s^2 ） of He-like neon, which are the two electronic dipole transitions in the Kα group emissions, are studied under dense plasma conditions by using the self-consistent field ion sphere model. The results show the two electronic dipole transitions red shift nearly linealy with the increase of plasma electron density. Moreover, the red-shift energy becomes more sensitive to the plasma electron density when the plasma electron temperature is lower. It is worthy to note that the energy discrepancy between these two spectral lines is equal to the exchange energy of state 1s2p（3^p1 ） . So, it is the first time that the exchange energy varying with plasma environment is observed both qualitatively and quantitatively. This result may be useful to dense plasma diagnosis in connection with variation of the relative position and the spectral fine structure splitting in high density plasmas.

关 键 词：光谱漂移 交换能 等离子体 类氦离子 

分 类 号：O536[理学—等离子体物理]