观察子午象线和弧矢象线的实验

本实验用很简单的设备，清晰地观察到光线在水面折射所形成的子午象线和弧矢象线．     

分光计观察钠灯谱线的方法及线系归属的研究

本介绍将基础仪器分光计稍作改动后可观察到钠光灯若干条谱线的方法、并通过理论计算对实验所观察到谱线的不归属进行了判断,同时利用精密仪器证实了此方法的可行性。     

对低压钠灯谱线的分析

采用看谱分析与摄谱分析相结合的方法，确定了钠光灯发光时出现红绿蓝等谱线的原因，并从钠原子的能级结构，跃迁机理予讨论。本文还对钠灯中充入惰性气体的种类予以确认，并讨论了惰性气体的作用。     

基于谱线检测的发射线星自动识别方法

针对我国即将建成的大型巡天项目(LAMOST),给出了一种基于谱线检测的发射线星自动识别方法.主要步骤:1)通过获取谱线特征匹配值进行恒星谱线整体估计;2)利用提取出的恒星谱线特征检测恒星的巴耳末(Balmer)线;3)对获取的特征匹配值采用阈值法,并结合恒星Balmer线的检测结果,进行发射线里判别.通过对SDSS DR4所有光谱进行识别,共获得了242条具有恒星发射线的特殊天体.根据星表查询结果,这些天体包括发射线星、激变变星和一些未知特殊天体等.大量真实光谱数据实验表明,本文方法可有效识别发射线星.     

线聚焦激光辐照Al靶所产生的紫外X射线谱线

本文叙述了采用线聚焦激光幅照Al靶所产生的高离化态离子的紫外X射线(XUV)谱线。利用Cowan的原子能级程序计算了不同离化态的离子谱线的波长和振子强度gf,辨认出140条离子谱线,其中有82条新谱线。 关键词：     

旋转悬链线

推导了转动悬链线满足的微分方程,数值求解微分方程并画出了旋转悬链线图形.讨论了悬链线高度与角速度的关系,实验数据验证了这个关系.     

由类氦离子共振线与互组合线强度比确定等离子体电子温度

聚变等离子体的光谱诊断,国内外已有了许多工作。如何在短波长上获得等离子体丰富的光谱信号,从而确定高温等离子体参数,是目前一个有意义的工作。 本工作在一台θ箍缩装置上,用掠入射真空紫外光谱仪,以对联三苯闪烁体为荧光转换材料,观测了类氦的CV40.2/40.7A,OⅦ21.6/21.8A等谱线信号,及CⅥ33.7A,OⅧ19.0     

线相干效应对测量重叠谱线线参数的影响

利用环形腔掺钛宝石激光自动扫描系统、公里级怀特池系统和信号探测系统，我们对氧分子Ａ带重叠谱线区（１３１６２．８５～１３１６５．３３ｃｍ￣（－１））进行了高分辨吸收光谱测量，给出了８条谱线的线宽、线强的实验值。同时通过对测量数据的分析，首次证明在谱线重叠区，谱线之间的线相干效应不仅影响谱线之间的吸收率，而且同样影响线参数测量值的精度。在０．１ＭＰａ与光程为１ｋｍ时，它对线强、线宽的测量值和透过率的最大影响分别可达８．８％、１６．６％和８．３％。     

TiVI真空紫外光谱

用1m法向入射光谱仪观察三电极真空火花发射的Ti五次离化光谱。在24～200nm波段内观察到157条TiVI的新谱线。根据新归属的TiVI谱线定出11个新能级,并对5个有疑问的能级值作了修正。     

高压合成立方氮化硼的振动光谱

 本文利用FT-IR和Raman光谱对用不同触媒高压合成的不同颜色立方氮化硼晶格振动的声子吸收和散射进行了研究。获得了较完整的晶格振动信息，并在1 000~1 300 cm^-1范围内，观测到了3个新的振动谱带，其中一个位于1 089 cm^-1， 归属为体TO声子和表面TO声子组合带，另两条513、801 cm^-1推测为杂质诱发吸收带。     

Saturation of Photoassociation in Cs Magneto-optical Trap

An ultrahigh resolution photoassociation spectrum of caesium atoms in a magneto-optical trap is presented. Hyperfine structure of the excited state molecule is obtained by using the lock-in method based on modulated cold atoms in this spectrum. Amplitude of resonant lines related to the rotational levels increases with photoassociation laser intensity, and saturation effect of photoassociation of cold atoms is observed in our experiment. The saturation intensity of photoassociation is deduced by fitting the experimental data to asaturation model based on scattering theory. Differences among saturation intensities of different rotational progressions in the υ=55 vibrational state of the caesium molecular long-range 0_g^- state have been found.     

XeCl B-X跃迁自发辐射谱压力关系的理论计算(英文)

采用假定所有旋转能级独立辐射和碰撞加宽劳仑茨线宽的准平衡模型,对XeCl B-X跃迁自发辐射谱进行了数值模拟计算,从而解释了高气压下谱线的加宽现象.本文采用的方法还可适用于其它双原子准分子.     

EPR of Mn2+ in Cd(COO)2· 3H2O single crystals

The electron paramagnetic resonance spectrum of Mn²⁺ has been investigated in cadmium oxalate trihydrate single crystals at room temperature. The spectrum, recorded in the X-band, consists of a set of lines all of which correspond to a single type of environment. None of the principal axes coincides with any crystallographic axis. The spectrum is satisfactorily described by a spin Hamiltonian with a rhombic crystalline electric field. The separations of the forbidden doublets (Δm = ± 1) in different electronic transitions have been calculated and compared with the observed doublet separations.     

New study on the XeVIII spectrum

Capillary light sources were used to observe the spectrum of seven-times-ionized xenon, XeVIII, in the 300-6000 Å wavelength range. Twenty-eight energy levels belonging to the 5s-9s, 5d-9d, 5g-9g, 7i-10i, 9l, 5p-9p, 4f-9f, 6h-9h and 8k-10k configurations were adjusted and 38 new spectral lines were classified. The XeVIII ionization energy was determined with improved accuracy using the polarization model. The analysis was supported by Hartree-Fock calculations. The weighted oscillator strengths for all the observed spectral lines were also calculated considering the fitted values for the energy parameters.     

氢和甲烷混合气体的受激喇曼散射

使用调Q Nd~(3+):YAG激光的二次谐波(532nm)作为泵浦源,探讨了氢和甲烷混合气体的受激喇曼散射效应。利用光学光谱分析仪(OSA)监测,在不同比例的混合气体中,观测到氢和甲烷各自的SRS谱线以及两种气体的联合谱线,[m,n,=0,|±1,±2,…];观察到斯托克斯和反斯托克斯的谱线频移。实验表明两种气体的混合使得氢和甲烷的受激喇曼散射过程发生了竞争和耦合。     

Energy levels and spectral lines of Ne VII

All experimental data on Ne VII, including previously unpublished beam-foil spectroscopy data, have been compiled and critically evaluated. More than a hundred spectral lines have been newly identified. For 40 transitions, the previous identifications have been revised. These revisions resolved all existing contradictions between previously published interpretations of the spectrum. An optimized level scheme has been derived from the total list of observed lines. About a hundred new energy levels have been found, including several highly excited hydrogenic levels. Based on these newly determined levels, as well as on the analysis of theoretical data, the ionization potential has been newly determined with improved confidence. Electronic supplementary material Online Material     

Low-temperature photoluminescence of MBE-grown GaAs subject to an electric field

Low-temperature photoluminescence of GaAs has been investigated in MBE-grown Al _x Ga_1–x As-GaAs single heterojunctions subject to an electric field. No peak energy shift is observed in the emission lines due to free excitons and excitons bound to isolated centers when the electric field is applied. In contrast, the excitonic lines arising from the previously described defect-induced bound exciton (DIBX) transitions exhibit a prominent low-energy shift when the electric field is increased. We attribute these lines to excitons bound to acceptor pairs. The excitons bound to distant pairs have smaller binding energies than those bound to closer pairs. They are, therefore, easily dissociated in a weak electric field. The electrons and holes thus dissociated may again be trapped by closer pairs, which results in a low-energy shift of the overall spectrum. The photocurrent measured as a function of the electric field supports Dingle's rule for the valence bandedge discontinuity.     

A critical compilation and extended analysis of the Ne V spectrum

Previous works devoted to the Ne V spectrum are very fragmentary and yield a rather controversial picture of this ion. A lot of unidentified lines are still reported in these multiple studies. In the present paper, Hartree-Fock calculations and least-squares fits over the whole set of the available data (including the most recent ones) have been performed. As a result, a comprehensive view of the Ne V spectrum is presented. 10 new energy levels and 40 newly classified lines are proposed. An improved value of the ionisation potential of Ne V is also proposed. Received 19 February 1999 and Received in final form 10 June 1999