荧光熄灭法测定前列腺素E1

本文研究了前列腺素Ｅ１（简称ＰＧＥ１）对甲醇荧光峰的熄灭作用，且其熄灭程度与ＰＧＥ１浓度间有较好的定量关系，线性回归方程为ΔＦ＝０．２２２ｃ＋９．３３×１０－２（ΔＦ为荧光熄灭值；ｃ为ＰＧＥ１浓度，单位为μｇ／ｍＬ），回归系数ｒ＝０．９９９３０。实验表明，用该法所得结果与紫外分光光度法所得结果较相吻合。     

单壁手性碳纳米管Γ点E1和E2振动模式

在卷曲法计算得到的单壁碳纳米管12个非简并的本征频率与手性和管径关系的基础上,继续讨论了简并的本征频率中E1和E2的振动模式,以及其频率与手性和管径的关系.     

The potential for which E n 1 ′ 12=E n 2 ′ l1 in nonrelativistic quantum mechanics

The answer is provided to the question ‘What is the potential for which E _{n 1} ^′ l₂=E _{n 2} ^′ l₁ in nonrelativistic Quantum Mechanics?’     

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Using the fully relativistic configuration interaction (RCI) method and the multi-configuration Dirac-Fock (MCDF) method and taking quantum electrodynamical (QED) effect and Breit correction into account, wavelengths, transition probabilities and oscillator strengths were calculated for electric dipole (E1) transitions and magnetic dipole (M1) transitions in Au⁵⁰⁺ ion. The obtained energy levels of some excited states and wavelengths of transitions in Au⁵⁰⁺ ion from the method were compared with other theoretical and experimental results, and a good agreement with other results was shown. The calculated transition probabilities and oscillator strengths in E1 transitions using the velocity and length gauges respectively confirmed the accuracy of our calculations. The calculation results indicated that for high-Z highly ionized atom, some forbidden transitions could be very important.     

3 S 1−3 D 1 mixing and E1 radiative transitions in charmonium

The radiative transitions ψ′→γ+χ _J and χ _J →γ+ψ are studied in the quark model with the ψ and ψ′ interpreted conventionally as³ S ₁ \(c\bar c\) states and the χ _J as³ P _J \(c\bar c\) states. In particular, the effect of³ S ₁?³ D ₁ mixing on the decay widths is calculated. The photon angular distributions in these decays are also studied and are found to be a more sensitive test of³ D ₁ admixtures in the Ψ states. The³ D ₁ content of the Ψ is found to be large but the estimate is very sensitive to the photon angular distributions. More precise measurements could help to explain the large ψ″ leptonic width.     

A note on the interpretation ofE 1,E 1+Δ 1 transitions in Ge

The paper deals with problems of the interpretation ofE ₁,E ₁+₁ transitions near 2 eV in Ge. The treatment of ac piezoreflectance spectra of Ge in this energy region shows that the transitionse ₁,E ₁+₁ are, in general, not well-described by any model of the pair of parabolic critical points of the same type; therefore neither of both frequently used models (3DM₁-pair or 2DM₀- pair) is appropriate. The hydrostatic componentW ₁(E) of the piezooptic tensor was extracted from the experimental ac piezoreflectance spectra and then treated by the symmetrization method for the precise determination of transition energies. This method does not depend on the type of the critical points pair and it is based on the existence of a symmetric linear combination of real and imaginary parts of the critical point contribution to the dielectric function.     

Hot hole effects in uniaxially stressedp-type germanium under E∥P∥ [1 1 1]

High field behaviour of holes in uniaxially stressedp-type germanium for stressP and the electric fieldE along the [1 1 1] axis is studied. The field dependence of the drift velocity, the frequency dependence of the longitudinal differential mobility and the spectral dependence of the sub-band population for direct hole transitions between the upper and lower splitted sub-bands are calculated by the Monte-Carlo method. A Gunn-type negative differential mobility is demonstrated to appear atP 7 to 8 kbar,E 0.15 to 4 kV cm^–1 in a frequency rangev 0 to 100 GHz. It is shown, that the stimulated emission and current increase observed by I. V. Altuhovet al. [1] cannot be ascribed to the direct hole transitions between the sub-bands because the population inversion of the transitions is absent.     

Nonradiative Transitions 3E → 1A1 and $$^{1}\tilde {E}$$ → 3A2 in the NV– Center in Diamond

Journal of Experimental and Theoretical Physics - A mechanism is proposed for a nonradiative transition between excited energy levels of the NV– center in diamond. The nonradiative transition...     

The E1 and E2 capture amplitudes in 12C(α,γ0)16O

Excitation functions of the %₀ capture transition in ¹²C(!,%)¹⁶O at /_% = 90^§ were obtained using a 4 2 4' BGO crystal in close geometry (E = 0.94 to 3.39 MeV) and a 2 2 2' BGO crystal in far geometry (E = 1.69 to 3.29 MeV), where the study of the reaction was initiated in inverse kinematics involving a windowless gas target. The small crystal detected essentially the E1 multipole component in the %₀ capture transition, while the large crystal observed approximately the angle-integrated sum of the E1 and E2 multipole components. Analysis of the two data sets together with data from previous work provided strong evidence that both multipoles are of equal importance at the relevant stellar energy E₀ = 0.3 MeV.     

Axion cosmology in automatic E6 × U(1) models

An automatic E₆ × U(1) axion model is constructed which is cosmologically consistent, predicts three families of fermions at low energies, and admits cosmic strings capable of seeding galaxy formation.     

Proton decay of isolated E1 resonances with “abnormal” isospin

Qualitative analysis of partial proton and elastic radiation widths of isolated E1 resonances with “abnormal” spin has been carried out within the semimicroscopic approach based on the random phase approximation with exact consideration of the single-particle continuum (continuum random phase approximation, CRPA). The results of the calculations for such resonances in the ⁹⁰Zr nucleus are compared with the available experimental data.     

Weak- and hyperfine-interaction-induced 1s2s ~1S_0→ 1s~2 ~1S_0 E1 transition rates of He-like ions

Weak- and hyperfine-interaction-induced 1s2s1S0→ 1s2 1S0E1 transition rates for the isoelectronic sequence of Helike ions have been calculated using the multi-configuration Dirac–Hartree–Fock(MCDHF) and relativistic configuration interaction methods. The results should be helpful for the future experimental investigations of parity non-conservation effects.     

Relativistic many-body calculations of E1, E2, M1, and M2 transitions rates for the 1 s 2 l′ 2 l′ ′ – 1 s 2 2 l lines in Li-like ions

Reduced matrix elements, oscillator strengths, and transition rates are calculated for all allowed and forbidden 1s2l′ 2l′ ′ – 1s ²2l electric dipole (E1), magnetic dipole (M1), electric quadrupole (E2), and magnetic quadrupole (M2) transitions in lithiumlike ions with nuclear charges ranging from Z?=?6 to 100. Relativistic many-body perturbation theory (RMBPT), including the Breit interaction, is used to evaluate retarded E1, M1, E2, and M2 matrix elements. The calculations start with a Dirac potential and include all possible 1s2l′ 2l′ ′ configurations, leading to seven odd-parity and nine even-parity states. First-order perturbation theory is used to obtain intermediate coupling coefficients. Second-order RMBPT is used to determine the matrix elements, which are evaluated for the 22, 20, 16, and 18 possible E1, M1, E2, and M2 transitions, respectively. A detailed discussion of the various contributions to the energy levels and E1, M1, E2, and M2 matrix elements is given for lithiumlike iron, Z?=?26. The transition energies used in the calculation of oscillator strengths and transition rates are evaluated using second-order RMBPT. Trends of E1, M1, E2, and M2 transition rates as functions of nuclear charge Z are shown graphically for 1s2l′ 2l′ ′ – 1s ²2l transitions.     

激光金等离子体中Au~(50+)离子E1、M1跃迁的理论研究

根据全相对论组态相互作用(RCI)方法和多组态Dirac-Fock(MCDF)方法,考虑量子电动力学(QED)效应和Breit修正,选取重要的电子组态,系统计算了激光金等离子体中类铜Au~(50+)离子nl-n′l′(n=4,l=s,p,d,f;n′=4,5,l′=s,p,d,f)电偶极(E1)跃迁和磁偶极(M1)跃迁的跃迁波长、跃迁几率和振子强度,并得到Au~(50+)离子部分激发态能级结构。计算得到的能级与波长与其他已有的理论和实验结果进行了比较,得到了较为满意的结果。分别采用长度规范和速度规范对电偶极(E1)跃迁参数进行了计算和比较,得到了很好的收敛。计算结果还表明,对于高Z高离化态离子,某些禁戒跃迁占有重要地位。     

考虑参数不确定性的高空电磁脉冲E1分量环境计算及分析

高空电磁脉冲的早期分量幅值高、频谱宽、分布范围广,是高空核爆的电磁效应的重要组成部分。分析了国内外高空电磁脉冲早期分量仿真计算法的研究进展,并选取基于高频近似并考虑电子与电磁场自洽作用的EXEMP算法进行详细介绍,通过数值计算结果总结了高空电磁脉冲的时域波形和空间分布随场源当量、爆高等参数变化的规律,与IEC标准约定的波形时域和空间特征一致。针对HEMP计算中部分参数的不确定性,分析参数取值偏差和波动对电磁脉冲计算结果的影响,使用多项式混沌方法联合Sobol全局敏感度指标对其进行不确定量化,得到电磁脉冲关键值可能分布的上下界、分布的概率密度等信息,分析各参数在特定取值范围内对电磁脉冲特征参数的影响及联合影响。     

稀土区奇A核M1和E2跃迁的性质

利用推广的粒子-转子模型研究了稀土区奇A核的M1和E2跃迁的性质,指出核心的十六极形变、转动哈密顿量中的二级科里奥利作用对M1(ΔI=1)和E2跃迁几率的Signature依赖性以及对Signature的平均值有着不容忽略的影响.对¹⁵⁷Ho的计算得到了能谱的Signature分离、B(M1;ΔI=1)值和[B(E2;ΔI=1)/B(E2;ΔI=2)]^1/2比值都同实验定性相符的结果.     

High-precision calculationsj of the 3,1 P 1 0 →1 S 0 E1 amplitudes for magnesium, calcium, and strontium

High-precision calculations of the ^3,1 P ₁ ⁰ (ns np→¹ S ₀(ns ²) E1 amplitudes were carried out for magnesium, calcium, and strontium (n=3, 4, and 5, respectively). The following results were obtained for the reduced matrix element 〈¹ P ₁ ⁰ ‖d‖ ¹ S ₀〉 of electric dipole moment operator: 4.03(2) au for Mg, 4.91(7) au for Ca, and 5.28(9) au for Sr. These matrix elements are necessary for calculating the van der Waals coefficients C ₆, which are used in evaluating the atomic scattering lengths. The latter determine the dynamics and stability of the Bose-Einstein condensate.     

Systematic study of the product((E(2_2~+)/E(2_1~+)) * B(E2)↑) through the asymmetric rotor model

A systematic study of the product((E(2_2~+)/E(2_1~+))*B(E2)↑) is carried out in the major shell space Z=50-82,N=82-126 within the framework of the asymmetric rotor model where the asymmetry parameter γ0reflects change in the nuclear structure.A systematic study of the product((E(2+)/E(2+))*B(E2)↑) with neutron number N is also discussed.The product((E(2_2~+)/E(2_1~+))*B(E2)↑) provides a direct correlation with the asymmetry parameter γ0.The effect of subshells is visible in Ba-Gd nuclei with N 82,but not in Hf-Pt nuclei with N 104.We study,for the first time,the dependency of the product((E(2_2~+)/E(2_1~+))*B(E2)↑) on the asymmetry parameterγ0.