Transmission characteristics of an excited-state induced dispersion optical filter of rubidium at 775.9 nm

The operation of an ultra-narrow bandwidth optical filter based on the 5P3/2→5D3/2 excited-state transition in rubidium vapor is reported. The 5D3/2 state is excited by a circularly polarized pump beam at 780 nm from a diode laser. The filter displays a single 398-MHz bandwidth at a peak transmission of 9.0%, which is narrower than the Doppler bandwidth. The dependence of peak transmission on the pump intensity and cell temperature is also given.     

类锂硅离子软X射线激光研究

在激光等离子体典型参数条件下，利用碰撞－辐模型计算了类锂硅离子５ｆ－３ｄ和４ｆ－３ｄ跃的粒子数反转比率和激光增益系数。讨论了不同热带条件和不同冷却速度下，激光增益系统数的变化。计算结果表明，高功率，短脉冲激光生产的高温等离子体在快速冷却条件下能产生软Ｘ射的线激光增益。     

激光烧蚀固体进样法测定出口铝锭中硅、铁、镓、铜和镁

用激光烧蚀固体进样法测定出口铝锭中硅、铁、镓、铜和镁,与国标方法相比较,无需样品前处理,直接测定,提高了工作效率。经对实际样品进行测定,结果与国标方法相一致。测量结果的相对标准偏差小于8.5%。     

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。     

Electric-dipole allowed （El） and forbidden （E2, M1 and M2） transition probabilities of 4f for N＋

By applying systematically enlarged multi-configuration Dirac-Fock wavefunction, the transitions for electricdipole allowed （E1） and forbidden （E2, M1 and M2） lines are studied among 4f pair coupling and low-lying configurations for singly ionized nitrogen. Most important effects of relativity, electron correlation, the rearrangement of electron density, Breit interaction, and quantum electrodynamic effects are included in the computation. Then, allowed （E1） and forbidden （E2, M1 and M2） transition probabilities of 4f for N＋ are obtained and compared with experimental results. Good agreement with available experimental results is found and most of the data of 4f are presented for the first time.     

A1Ⅱ离子3snp^1p1序列能级辐射寿命的非单调变化

本文考虑了一价铝离子双激发干扰态３ｐ４ｓ＾１ｐ１＾０对ｓｎｐ＾１Ｐ１＾０Ｒｙｄｂｅｒｇ序列的强相互作用,多组态ＨＦＲ自洽场方法计算了Ａ１Ⅱ３ｓｎｐ＾１Ｐ１０（ｎ＝３－１０）序列能级的辐射寿命,与已有的实验和理论计算结果进行了比较,结果表明该序列能级寿命随主量子数ｎ呈现非单调变化。     

离焦量对空气中激光诱导铜等离子体光谱特性的影响

利用Nd: YAG脉冲激光在空气中烧蚀金属Cu靶,获得等离子体光谱;采用改变离焦量的方法,研究了离焦量的变化对谱线结构及谱线强度的影响;分析了离焦量分别为1mm、0mm和-2mm时,沿靶面法线方向不同空间距离处电子温度的演化规律;并对等离子体光谱的特性和产生机制进行了讨论. 结果表明,谱线结构、谱线强度和等离子体的电子温度都与离焦量的变化密切相关,聚焦点在-2mm处CuⅠ谱线相对强度出现峰值,电子温度数值最大;聚焦点在-0.5mm和-1.0mm附近谱线相对强度遽然降低的现象是由于等离子体的屏蔽效应造成的.     

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.     

超声波原油破乳脱水的声场参数实验研究

本文阐明了超声波原油破乳脱水基本原理,实验研究了超声场参数对脱水率的影响,其中,声强,辐照时间和频率和影响原油脱水率的主要因素,而间歇比,脉冲宽度为次要回素,对本实验系统而言,声场参数有一个最佳值或范围,声强0.65W/cm^2,频率20kHz,间歇比8,脉冲宽度9.7ms,辐照时间5－10min.     

高灵敏度色散型慢光干涉仪的仿真研究

设计了一种基于慢光介质色散特性的新型干涉装置,研究其物理过程,证明利用慢光介质可以有效提高干涉仪的光谱灵敏度,并且光谱灵敏度与慢光介质的群折射率成正比。同时,进一步具体分析慢光介质GaAs的色散特性,给出研究色散型慢光干涉仪的一般性方法,并证明使用慢光介质GaAs在近红外区域可以提高光谱灵敏度2倍左右。