单电离态Kr原子强跃迁能级振子强度的研究

阐述了用束-箔方法通过测量单电离态Kr原子强跃迁谱线的能级寿命来 确定振子强度f-值的方法,并对确定出的强跃迁谱线的能级吸收振子强度进行简要讨 论。     

类钾离子4s 2S1/2─3d 2D3/2电四极矩E2光谱跃迁的理论研究

采用全相对论量子力学GRASP²程序,广义平均能级EAL模型,在核的有限体积效应,Breit和QED效应的高阶扰动基础上,考虑到原子实的极化,系统地计算了高剥离类钾离子4s ²S_1/2─3d ²D_3/2电四极矩E2光谱跃迁的能级间隔,跃迁概率和振子强度,结果表明：考虑原子实极化效应后,计算的精细能级结构间隔与实验数据之间的系统误差基本消除,其跃迁概率和振子强度属首次报道. 关键词： 高剥离态 能级间隔 振子强度     

硅（Si）原子高激发态能级自然辐射寿命的测量

能级的自然辐射寿命是确定跃迁几率和振子强度所需的重要参数. 目前,硅原子高激发态能级自然辐射参数的实验数据还很缺乏,因此本文运用时间分辨激光诱导荧光和激光烧蚀等离子体技术,测量了硅原子位于47351.55 ~ 63844.65 cm?1之间的14个高激发态能级的自然辐射寿命. 实验结果分布在8.7 ~ 43.4 ns之间,测量误差均小于10%,其中9个能级的结果属于首次报道. 本文结果与可靠的分支比数据相结合可确定相关能级的跃迁几率和振子强度实验值.     

FeⅩⅪ离子电偶级、磁偶极及电四极跃迁振子强度的计算

讨论了使用MCHF方法优化径向波函数以获取大量原子参数的方法,由得到的波函数计算了FeXXI离子的相对论与非相对论能级,将计算能级与已有的实验结果进行了比较.对电偶极、磁偶极以及电四极的振子强度进行了非相对论与相对论修正的计算,对非相对论计算的振子强度,长度与速度两种表示符合较好.     

FeXXI离子电偶级、磁偶极及电四极跃迁振子强度的计算

讨论了使用MCHF方法优化径向波函数以获取大量原子参数的方法，由得到的波函数计算了FeXXI离子的相对论与非相对论能级，将计算能级与已有的实验结果进行了比较，对电偶极，磁偶极以及电四极的振子强度进行了非相对论与相对论修正的计算，对非相对论计算的振子强度，长度与速度两种表示符合较好。     

BrV离子4p^3—4s4P^2跃迁的能级和振子强度

利用组态相互作用理论和参数外推方法,计算了BrV离子4p~3 4s4p~2跃迁的能级、谱线波长和电偶极跃迁的振子强度。4s4p组态的能级计算值与已有数据很符合,4p~3组态的能级以及4p~3-4s4p~2跃迁的谱线波长和振子强度纯属预言值。     

S9^11＋离子能级和振子强度

用组态相互作用程序ＣＩＶ３计算了Ｓｉ＾１１＋离子能级和振子强度。在计算中，考虑了一个电子保持在Ｉｓ轨道上，其余两个电子各种布居组态的组态相互作用。这种方法大大地改善了振子强度的计算结果。     

CuⅠ-AsⅤ离子3d104s-3d94s4p跃迁组态的能级和振子强度

利用组态相互作用理论和参数拟合内插的方法计算了类铜ＣｕⅠ－ＡｓⅤ离子３ｄ１０４ｓ－３ｄ９４ｓ４ｐ跃迁组态的能级、谱线波长和电偶极跃迁的振子强度。３ｄ９４ｓ４ｐ组态能级的所有计算结果与现有实验数据符合得很好。而ＺｎⅡ和ＧａⅢ离子的大部分能级纯属预测计算结果。给出了３ｄ１０４ｓ－３ｄ９４ｓ４ｐ能级跃迁的谱线波长和振子强度。     

Er3+:GdVO4中Er3+离子的光谱参数计算和晶场中能级分裂的讨论

对Er3+:GdVO4样品的光谱参数以及Er3+在晶场中能级的分裂情况进行了研究.首先对样品进行了吸收光谱的测量,接着用Judd-Ofelt理论拟合出了Er3+在GdVO4晶体中的强度参量Ωt,并由此计算了跃迁的振子强度、自发辐射跃迁速率、荧光分支比和积分发射截面.通过计算结果可以发现有较多能级之间的跃迁都有大于10-6的振子强度和大于10-18 cm的积分发射截面,并且具有较高的荧光分支比,特别是2H11/2→4I15/2,4S3/2→4I15/2,4F9/2→4I15/2和4I13/2→4I15/2等几个强发光能级除了具有较大的振子强度和积分发射截面外还有很好的应用前景,因此也更加值得关注.最后还利用群论讨论了Er3+离子在GdVO4晶场中各能级的分裂情况并对各Stark子能级的Jz混杂情况进行了分析.     

Fe XVII离子能级和振子强度的相对论多组态Dirac-Fock计算

本文用相对论多组态的狄拉克-福克(Dirac-Fock)(MCDF)近似方法计算了铁的类氖离子FeXVII的2p~53s,和3p和3d态的所有能级以及3s—3p,3p—3d跃迁的电偶极振子强度f值.理论计算的能级值同实验值的比较表明,使用MCDF方法计算类氖等电子序列的能级会得到与实验值符合得比较好的结果.因无实验数据可作比较,本文得到的振子强度值纯属理论预言值.     

高平均功率光纤激光技术基础: (2) 谐振腔

概述光纤激光谐振腔的基本结构、主要组件及其功能,介绍高功率光纤激光谐振腔的发展现状。以光纤光栅为研究载体分析谐振腔时空频域多维特性。从中心波长、线宽和形态三个方面介绍谐振腔输出光谱特性调控的机理、方法与研究进展;从本征模与反射谱的关联角度介绍谐振腔输出模式调控的机理、方法与研究进展;介绍谐振腔瞬态时域特性建模的最新成果,指出时频特性的关联及其对非线性效应产生的影响。最后介绍两种无腔结构的高功率光纤激光。     

Oscillator model of qubits and its entanglement properties

The two-mode symmetric oscillator is used to construct the qubit model as the superposition of the first excited degenerate level states of the oscillator. The entanglement properties of the oscillator states are studied using the known criterion of separability. Application to the quantum computing model based on light modes propagating in optical waveguides is briefly discussed.     

The role of the polarization of a nonresonance external harmonic field in the dynamics of a nonautonomous spin oscillator

The results of an analysis of the action of a nonresonance external harmonic electromagnetic field on a quantum oscillator whose active medium is a two-level spin system, i.e. spin oscillator are briefly presented. The role of external field polarization in the dynamics of a nonautonomous spin oscillator is demonstrated. For the circular polarization of a nonresonance external field the shift of oscillation frequency of the spin oscillator is observed. For the linear polarization of a nonresonance external field the specific feature of spin oscillator synchronization at the third overtone of external field frequency is observed, along with an oscillation frequency shift.     

非对易相空间Dirac oscillator的研究

在极坐标系中研究了非对易相空间中的Dirac oscillator问题.研究显示:系统的波函数可以表示为合流超几何函数,而非对易相空间Dirac oscillator的量子行为类似于朗道问题.最后,对η=0和对易极限两种特殊情况进行了简单讨论.     

An alternative factorization of the quantum harmonic oscillator and two-parameter family of self-adjoint operators

We introduce an alternative factorization of the Hamiltonian of the quantum harmonic oscillator which leads to a two-parameter self-adjoint operator from which the standard harmonic oscillator, the one-parameter oscillators introduced by Mielnik, and the Hermite operator are obtained in certain limits of the parameters. In addition, a single Bernoulli-type parameter factorization, which is different from the one introduced by M.A. Reyes, H.C. Rosu, and M.R. Gutiérrez [Phys. Lett. A 375 (2011) 2145], is briefly discussed in the final part of this work.     

Optomechanical control of atoms and molecules

We briefly review some of our recent and ongoing work on nanoscale optomechanics, an emerging area at the confluence of atomic, condensed matter and gravitational wave physics. A central tenet of optomechanics is the laser cooling of a moving mirror, typically an end mirror of a Fabry-Perot resonator, to a point near its quantum-mechanical ground state of vibration. Following a general introduction we discuss how the motion of such a macroscopic quantum oscillator can be squeezed, and then show how the placement of a ferroelectric tip on the oscillator allows the coherent manipulation and control of the center-of-mass motion of ultracold polar molecules.     

6mm高稳定Gun振荡器

本文介绍了一种48GHz高稳定振荡器的研制,该振荡器具有系统尺寸小、传输信息量大、方向性好和频率稳定度高等特点,文章对管子的选型、振荡腔和稳频腔工作模式的选择及稳频系数和稳频腔Q值因数的优化设计和计算进行了详细的描述.实验测试结果表明,振荡器达到了预期的性能指标和要求.     

高平均功率光纤激光技术基础: (1)概述

概述高平均功率光纤激光技术基础领域的最新研究成果,阐明高平均功率光纤激光的技术进步与谐振腔、模式、非线性效应等基础科学问题深度发展的相互促进过程,给出本系列论文的写作思路。     

Certain class of generalized isotropic perturbations of thes-wave three-dimensional harmonic oscillator

In this paper we study a certain class of generalized perturbation problem for the isotropic three dimensional harmonic oscillator, forl=0 states only, for all excited states. The efficacy of our formalism is tested by studying the Killingbeck potential in detail. We also briefly present our results using the diagonal Padé approximants.     

Calculation of highly excited eigenstates of chaotic quantum systems

Computational methods for the calculation of a large number of eigenstates of coupled oscillator system are developed and discussed. These calculations have enabled us to identify and investigate properties of an infinite set of states sharply localized in configuration space in this system. Some of the results and their significance are discussed. Extensions to three-dimensional systems are also briefly considered.