Influence of relaxation effects on probabilities of the 2s2p35S2－2s22p2 3P1，2 intercombination transitions in NII

Transition probabilities of the 2s2p^3 {}^5S_2－2s^22p^2 {}^3P_{1,2} intercombination transitions in NII have been calculated by using a large-scale multiconfiguration Dirac－Fock method. In the calculation the most important effects of relativity, correlation, and relaxation are considered. From the calculated transition probabilities, the lifetime of the 2s2p^3 {}^5S_2 metastable state is derived. The result is in excellent agreement with the latest experimental result. In the meantime the influence of anomalously strong relaxation effects on probabilities of the 2s2p^3 {}^5S_2－2s^22p^2 {}^3P_{1,2} lines in NII have been found.     

与闪电过程有关的NII离子能级寿命的理论计算

用相对论多组态DiracFock方法,系统地计算了与闪电过程有关的NII离子2p2,2s2p3,2p3s,2p3p,2p3d组态能级之间的辐射跃迁概率,并由此推算出这些组态的35个能级的寿命.计算中考虑了相对论效应、电子关联、延迟效应等重要贡献.与已有的理论计算比较,目前计算的结果更接近最新实验值.据此,进一步给出了2p3d3F能级寿命新的理论预言值     

SITE GAINS AND ITS ESTIMATION METHOD OF A LIGHTNING LOCATION SYSTEM

We discuss a new concept in lightning location system (LLS). Specitically,it is anoptimum method of lightning signal strength and a parameterization method of the site gaincurve estimation in LLS. Site gain correction curves for all DFs for 1989 were found byusing the data observed in an LLS of three direction finders (DFs) in Beijing region. Theresult shows that the curves, as a function of measured bearing, only include the one- andtwo-cycle sinusoidal components. It also indicates that the larger the site errors which DFhas, the larger the amplitude of the site gain curve. In this LLS, the ranges of site gainare 0.9--1.2, 0.85--1.05, 0.9--1.1 for DF1, DF2 and DF3 respectively. For discussion, we suggested a model for site gains due to dipole radiation. This modelcan be used to reasonably explain the characteristics of structure of site gain curves.     

与闪电过程有关的NⅡ离子光谱

将原子结构理论应用于与雷电相关的物理过程的研究 ,用多组态Dirac Fock方法 ,且系统考虑了相对论效应、电子关联、延迟效应等重要贡献 ,计算了与闪电过程有关的NⅡ离子光谱线波长、跃迁几率、振子强度以及相应的激发能量等参数 ,据此 ,对已观测到的闪电光谱做了比以前更详细的指认 ,为闪电过程物理机制的探讨以及进一步的实验研究提供了参考数据。     

交叉环磁天线雷电定位系统场地增益及其求解方法

本文通过分析场地增益产生的原因,认为各DF的“场地增益”是随方位角变化的函数,并提出了一种求解多站定位系统DF“场地增益”曲线的参数化方法,用此法研究了北京三站DF系统,结果表明:(1)不同的DF站具有不同的“场地增益”曲线,DF1的增益波动范围为0.9—1.2,DF2,DF3的分别为0.85—1.05和0.90—1.12;(2)“场地增益”曲线主要由常数项、1周期项和2周期项组成,其它成分很小,理论分析表明,偶极辐射可能是产生“场地增益”的主要原因,电偶极辐射会引起1周期的增益波动,磁偶极辐射会产生2周期的增益波动。     

N II离子禁戒跃迁几率的理论计算

用多组态Dirac Fock方法 ,系统考虑了相对论效应、电子关联、延迟效应等重要贡献 ,计算了NII离子 2p3d— 2p2 以及 2p3d— 2p3p (ΔL =± 2 ,ΔS =± 1)禁戒跃迁的几率 .与已有的理论相比 ,目前计算的精度有了明显提高. The forbidden transition probabilities have been calculated for the 2p3d -2p 2 and 2p3d-2p3p(ΔL=±2, ΔS=±1) spectra of N II by using a large-scale multiconfiguration Dirac-Fock (MCDF) method. The most important effects of relativity, correlation, and relaxation are considered in the calculation Comparing with other calculations, a remarkable improvement is achieved.     

弛豫与关联效应对NII离子2s22p3s3P1—2s22p21D2与2s22p3s1P1—2s22p23P0,1,2自旋禁戒跃迁概率的影响

用多组态Dirac-Fock方法，并系统考虑相对论效应、电子关联、弛豫效应等重要贡献，计算了NII离子2s22p3s 3P1—2s22p21D2和2s22p3s 1P1—2s22p23P0,1,2自旋禁戒跃迁概率和振子强度-通过比较计算证实：弛豫和关联效应对禁戒跃迁概率的影响非常大，考虑了这些效应后，计算结果有显著的改善-由跃迁概率和振子强度的计算值推断，2s22p3s 3P1—2s22p21D2的谱线强度应该比原有的理论预言值小- 关键词： 跃迁概率 多组态Dirac-Fock方法     

与闪电过程有关的NⅡ离子能级寿命的理论计算

用相对论多组态Dirac-Fock方法，系统地计算了与闪电过程有关的NⅡ离子2p^2,2s2p^3,2p3s,2p3p,2p3d组态能级之间的辐射跃迁概率，并由此推算出这些组态的35个能级的寿命，计算中考虑了相对论效应，电子交联，延迟效应等重要贡献，与已有的理论计算比较，目前计算的结果更接近最新实验值，据此，进一步给出了2p3d^3F能级寿命新的理论预言值。     

N II离子禁戒跃迁几率的理论计算

用多组态Dirac-Fock方法, 系统考虑了相对论效应、电子关联、延迟效应等重要贡献, 计算了N II离子2p3d-2p2以及2p3d-2p3p (ΔL＝±2, ΔS＝±1)禁戒跃迁的几率. 与已有的理论相比, 目前计算的精度有了明显提高.