Atomic Coherence in the Micromaser Injected with Slow V-type Three-State Atoms: Emission Probability

The effects of atomic coherence on the single-mode two-photon micromaser injected with slow V-type three-state atoms are studied for the first time.It is shown that the atomic coherence can modify the atomic emission probability.The effects of the atomic centre-of-mass momentum,the cavity length and other parameters are also studied.

Stark spectra of Rydberg states in atomic cesium in the vicinity of n=18

The Stark structures in a cesium atom around n=18 are numerically calculated. The results show that the components of 20D states with a small azimuthal quantum number ｜m｜ shift upward a lot, and those with a large ｜m｜ shift downward a little within 1100 V/cm. All components of P states shift downward. Experimental work has been performed in ultracold atomic cesium. Atoms initially in 6P3/2 state are excited to high-n Rydberg states by a polarization light perpendicular to the field, and Stark spectra with ｜m｜=1/2,3/2,5/2 are simultaneously observed with a large linewidth for the first time. The observed spectra are analyzed in detail. The relative transition probability is calculated. The experimental results are in good agreement with our numerical computation.

Semiclassical and Quantum-Mechanical Formalism Applied in Calculating the Emission Intensity of the Atomic Hydrogen

The energy spectrum of the hydrogen atom has been applied in calculating the time rate of energy transitions between the quantum states of the atom. The formal basis of the approach has been provided by the quantum properties of energy and time deduced from the Joule-Lenz law. The rates of the energy transitions obtained in this way were compared with the quantum-mechanical probabilities of transitions calculated earlier by Bethe and Condon and Shortley for the same pairs of the quantum states.

Relativistic atomic data for W XLVⅡ

Energy levels, radiative rates, and lifetimes are calculated for all levels of 3s23p, 3s23d, 3s3p2, 3s3d2, 3s3p3d, 3p23d, 3s3d2, 3p3d2, 3p3, and 3d3 configurations of Al-like tungsten ion （W XLVII）. Multiconfigurational Dirac-Fock （MCDF） method is adopted for calculating energy levels and radiative rates. Oscillator strengths, radiative rates, and line strengths are reported for some E1 transitions from the ground level. Comparisons are made with the available data in the literature and good agreement has been found which confirms the reliability of our results.

Atomic structure calculations for F-like tungsten

Energy levels, wavefunction compositions and lifetimes have been computed for all levels of ls^22s^22p^5, ls^22s^2p^6, ls^22s^22p^43s, ls^22s^22p^43p, and ls^22s^22p^43d configurations in highly charged F-like tungsten ion. The multiconfigurational Dirac-Fock method （MCDF） is adopted to generate the wavefunctions. We have also presented the transition wavelengths, oscillator strengths, transition probabilities, and line strengths for the electric dipole （El） and magnetic quadrupole （M2） transition from the ls^22s^22p^5 ground configuration. We have performed parallel calculations with the flexible atomic code （FAC） for comparing the atomic data. The reliability of present data is assessed by comparison with other theoretical and experimental data available in the literature. Good agreement is found between our results and those obtained using different approaches confirm the quality of our results. Additionally, we have predicted some new atomic data for F-like W that were not available so far and may be important for plasma diagnostic analysis in fusion plasma.

Fine Structure Calculations of Atomic Data for Ar XVI

Fine structure energy levels, wavelengths, log gf and allowed transition probabilities (E1) have been calculated for Lithium-like Ar XVI. The optimized electrostatic parameters by a least square approach, have been used in the calculation to include the configuration interaction and relativistic effects. A total number of 69 Ar XVI levels having total angular momenta, 1/2 ≤ J ≤ 9/2 of even and odd parities, orbital angular momenta 2 ≤ l ≤ 4, with 546 E1 transitions for 6 ≤ n ≤ 10 are considered using the relativistic effect in the Breit-Pauli method, where n is the principal quantum number. A comparison is made with the available results in literature.

New atomic data for Kr XXXV useful in fusion plasma

Energy levels and emission line wavelengths of high-Z materials are useful for impurity diagnostics due to their potential application in the next generation fusion devices.For this purpose,we have calculated the fine structural energies of the 67 levels belonging to the 1s 2,1s2l,1s3l,1s4l,1s5l,and 1s6l configurations of Kr XXXV using GRASP（general purpose relativistic atomic structure package） code.Additionally,we have reported the transition probabilities,oscillator strengths,line strengths,and transition wavelengths for some electric dipole（E1） transitions among these levels.We predict new energy levels and radiative rates,which have not been reported experimentally or theoretically,forming the basis for future experimental work.

对《大学物理》论文“关于拉比强信号理论的疑问和思考解答”再讨论

本文对《大学物理》论文“关于拉比强信号理论的疑问和思考解答”中讨论的问题进行了重新讨论,其理论推导更简洁,物理解释更准确.通过本文我们再次强调,在量子理论中,描述状态的不是概率,而是概率幅.概率相同的状态,概率幅可以不同,从而状态不同.

Emission Intensity in the Hydrogen Atom Calculated from a Non-Probabilistic Approach to the Electron Transitions

Quantum aspects of the Joule-Lenz law for the transmission of energy allowed us to calculate the time rate of energy transitions between the quantum states of the hydrogen atom in a fully non-probabilistic way. The calculation has been extended to all transitions between p and s states having main quantum numbers not exceeding 6. An evident similarity between the intensity pattern obtained from the Joule-Lenz law and the corresponding quantum-mechanical transition pro-babilities has been shown.

Dynamic stabilization of Na atom in an intense pulsed laser field

We investigate theoretically the ionization properties of the valence electron for the alkali metal atom Na in an intense pulsed laser field by solving numerically the time-dependent Schrodinger equation with an accurate l-dependent model potential.By calculating the variations of the ionization probabilities with laser peak intensity for wavelengths ranging from 200 nm to 600 nm,our results present a dynamic stabilization trend for the Na atom initially in its ground state（3 s） and the excited states（3 p and 4 s） exposed to an intense pulsed laser field.Especially a clear ＂window＂ of dynamic stabilization at lower laser intensities and longer wavelengths for the initial state 4 s（the second excited state） is found.By analyzing the time-dependent population distributions of the valence electron in the bound states with the different values of principal quantum number n and orbital quantum number l,we can attribute the dynamic stabilization to the periodic population in the low-excited states since the valence electron oscillates rapidly between the lowly excited states and the continuum states.

Transmission of N-Atoms Produced by N₂Flowing Microwave Afterglows through Hollow Tubes

Transmission of N-atoms (T N ) through small diameters tubes (1.5 and 3 mm internal diameter (i.d) and 9, 50 and 80 cm length for silicone tubes, 1.5 mm i.d and 6.5 cm length for stainless steel tubes) has been measured in late N2 and Ar-N2 flowing afterglows of microwave plasmas in continuous and pulsed gas injection at a flow rate of 1 and 3 Standard liter by minute (Slm), a gas pressure from 2 to 4 Torr for N2 and 20 Torr for Ar-1%N2 and a plasma power from 150 to 300 Watt. From the experimental TN values, it is deduced the γ-destruction probability inside the tube walls as being y = (1-1.6)×10-3 for the silicon tubes and y = (1.6-2)×10-2 for the stainless steel tubes.

Ordered Structures of M-ions in Intercalation Compounds M_xTX_2 Using Probability Wave Theory of Atomic Configuration

In this paper, an ion-vacancy lattice gas model is presented for M-ions occupying octahedrally coordinated sites in the intercalation compounds MxTX2. The ordered structures of M-ions are studied using probability wave theory of the atomic configuration. Three stablest ordered structrues have been deduced and the role of interaction parameters in the formation of ordered structures is analysed quantitatively. An the known experiment results are analysed and discussed.

APPLICATION OF THE PROBABILITY WAVE THEORY OF ATOMIC CONFIGURATION——THE ORDERED STRUCTURES OF COMPOUND PEROVSKITE MATERIALS

The theory of the probability wave theory of atomic configuration is applied to the studyof the atomic configuration of the stablest superlattices formed in the compound perovskitestructure. For the first time seven basic ordered structures have been deduced theoretically,and compared with the experimental results.

PROBABILITY WAVE THEORY OF THE ATOMIC CONFIGURATION FOR MULTI-COMPONENT CRYSTAL STRUCTURES

It is suggested that there is a kind of probability wave of the atomic configuration p(R)in crystals that can be deduced from the eigenequation of the ionic interaction Hamiltonian,and it has definite physical meaning. By use of the probability wave of the atomic con-figuration, the occupation probabilities of different kinds of atoms at lattice sites in multi-component solutions can be studied, and the crystal structures of multi-component solutionscan be predicted.

混合态二能级原子双光子过程中原子的压缩效应

本文采用时间演化算符方法和数值计算研究了相干光场与混合态二能级原子相互作用双光子过程中原子的压缩效应．结果表明：原子初始所处的混合态对原子压缩性质有较大的影响，当０．８５＜Ｓ＜１时，会周期性地呈现出短时的原子压缩效应，随着原子初始混合程度的增大，原子越来越远离压缩状态．

基于攻击图节点概率的网络安全度量方法

为了保护网络中关键信息资产,评估分析网络的整体安全性,提出了一种基于攻击图节点概率的网络安全度量方法。该方法改进了原子攻击节点自身概率的计算模型,引入累积可达概率,在此基础上,研究了网络安全风险评估模型。实验结果表明,所提评估方法能够准确地评估目标状态的安全级别和网络的整体风险。

B^(3+)+He碰撞过程中电子捕获几率的计算

利用分子轨道展开方法对B3+离子和He原子的碰撞势能进行了计算并与实验值做了比较,在确认了所使用的参数完全准确可靠的情况下。

温度对铷原子D_2线饱和吸收光谱的影响

从理论上分析了铷原子蒸汽温度对87Rb和85Rb D2线饱和吸收光谱在消除了多普勒背景情况下的光谱相对强度的影响.由于有效原子数密度、多普勒加宽、电极化率受温度变化的影响,每一条超精细谱线的相对强度随着温度的升高都会出现先增大后减小的变化趋势,相对强度最高时的温度称为最佳温度.对于87Rb或85Rb来说,不同超精细谱线最佳温度不同的主要原因是由于烧孔面积和跃迁几率不同造成的,而87Rb和85Rb不同超精细谱线最佳温度不同的主要原因是由于它们在自然界中丰度不同造成的.

高压静电雾化雾滴粒径双峰分布概率密度模型

为预测毛细管-环电极配置的高压静电雾化系统下水静电雾化雾滴粒径的分布规律,采用颗粒动态分析仪测试了该系统的雾化雾滴粒径。当环电极电压在15-25 kV之间时,静电雾化模式为泰勒锥射流模式,雾滴粒径呈显著双峰分布规律,对此利用一种可双峰分布的概率密度函数建立了预测该模式下粒径分布规律的统计学模型,并与试验数据对比进行了误差分析,讨论了误差原因。结果表明：随着电压的增加,电场力耦合因素的影响将导致误差增大;在每个电压工况下最大误差均出现在双峰之间的谷值附近,但均〈15%,总体上该模型能较好地与试验数据相符。

二项式光场与Ⅴ型三能级原子相互作用系统量子特性的精确解

在非旋波近似下,对二项式态光场与V型三能级原子相互作用系统的布居几率和量子纠缠进行了精确求解。研究了二项式态光场参数η对原子布居几率和量子纠缠的影响,并讨论了初始时刻原子能级的叠加对量子纠缠的影响。结果表明:随着η的增大,原子布居几率塌缩回复的周期逐渐增大,当η较大时,布居几率塌缩区与回复区出现了混沌现象。此外,随着η的增大,量子纠缠演化的周期性逐渐消失,当原子初始时刻处于激发态时,纠缠初始阶段数值及演化平均值均逐渐增大;而当原子初始时刻处于叠加态时,初始阶段纠缠的数值会逐渐降低。原子布居几率以及光场与原子之间的纠缠演化曲线在非旋波近似下均呈现小锯齿状振荡。