等离子体效应对类氦氖Kα线系电偶极辐射的影响

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

The spectra shifts for the intercombination line (1s2p(P-3(1))-> 1s(2)) and the resonance line (1s2p(P-1(1))-> 1s(2)) of He-like neon, which are the two electronic dipole transitions in the K alpha 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(P-3(1)). 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.