Oscillator strengths,transition probabilities and lifetimes involving 2p 3s and 2p 3d singlet and triplet states for allowed transitions in OV

Configuration interaction wavefunctions are used to calculate energy separations, wavelengths, oscillator strengths (length and velocity forms), transition probabilities and lifetimes for absorption transitions to the 2p 3s and 2p 3d singlet and triplet states for OV. It is seen that, for transition from different states of the same symmetry, inclusion ofn=4 correlation orbitals in the wavefunction can have a quite different effect on the oscillator strengths. Comparison with recent beam-foil experimental data is generally good. A common set of radial fuctions is used.     

Mg原子3p3/2nd系列自电离分支比的研究

利用多通道量子亏损理论(MQDT),结合已知的K矩阵,研究了受实验条件限制目前无法得到的Mg原子3p3/2nd(J=1,3)系列的自电离分支比,同时对3pnd系列的部分自电离光谱作了计算,并取得了和实验比较吻合的结果。结合分支比研究结果探讨了Mg原子的能级结构特点及粒子数反转的可能性     

Spin-forbidden transitions between 2p 2 and 2s2p states in the beryllium isoelectronic sequence

Fine-structure splittings, wavelengths and transition probabilities are evaluated for transitions 2p ^{2 1} S ₀→2s2p ³ P ₁ ⁰, 2p ^{2 1} D ₂→2s2p ³ P _J ⁰ (J=1, 2) and 2p ^{2 3} P _J →2s2p ¹ P ₁ ⁰ (J =0, 1, 2) in beryllium-like ions using configuration interaction wavefunctions. Some significant differences with previous calculations are obtained. At present there are no experimental results. However, from calculations reported here it should clearly be worthwhile to search for these lines in laboratory and astrophysical spectra. The decay of the 2p ^{2 1} D ₂ level is discussed.     

Electronic transition moments between excited singlet states of the H2 molecule

The twelve transition moments which connect each of the three ¹Σ_g⁺ states EF, GK, and $\text{H}\text{H}$ with the three ¹Σ_u⁺ states B,B′, $\text{B″}\text{B}$ and with the state C¹Π_u were computed in the range of internuclear distances 1.25 ≤ R ≤ 15 a.u. using accurate electronic wavefunctions. The relative phases of the wavefunctions, which determine the signs of the transition moments, were consistently defined at all R values. The strong R dependences of the transition moments reflect the R-dependent changes in electronic character of the states involved in these transitions. At large R values the ¹Σ_g⁺-¹Σ_u⁺ transition moments are dominated by the two-electron charge resonance in the ionic configuration H⁺ + H^? whose transition moment is $\text{M(R) ? R}$.     

类铍离子内壳激发态1s2p3 3P0、3D0及2s2p3 3D0 的俄歇宽度和俄歇分支率

采用鞍点变分方法和鞍点复数转动方法并考虑相对论修正和质量极化效应,计算了类铍离子内壳激发态1s2p3 3P0、3D0和内壳双激发态2s2p3 3D0的俄歇宽度、俄歇分支率和俄歇电子能量.同时还对1s22p2 3Pe态到1s2p3 3P0、3D0态(Z=4~10)的振子强度和辐射跃迁率进行了计算,计算结果与其他理论结果以及实验数据符合得很好.     

高Z类钴Te25+离子3p63d9-3p53d10,3p63d9-3p63d84p跃迁及振子强度的计算

用多组态自洽场方法,结合我们提出的半经验拟合公式,计算了高Z类钴Te25+离子3p63d9-3p53d10,3p63d9-3p63d84p跃迁和振子强度,与实验符合得较好。     

Photoionization cross-section measurements from the 2p, 3d and 3s excited states of lithium

The photoionization cross-sections from the 2p²P_{1/2, 3/2}, 3d²D_{3/2, 5/2} and 3s²S_1/2 excited states of lithium have been measured at different ionizing laser wavelengths, above the first ionization threshold. The experiments are performed by using a thermionic diode working in the space charge limited mode and the cross-sections are measured by employing the saturation technique. By changing the ionization photon energy, a smooth frequency dependence of the cross-sections has been observed for the 2p and 3d states. The cross-section from the 3s excited state has been measured at a single photon energy. The measured values of the photoionization cross are compared with the available data.     

Comparison of analyzing powers for the charge symmetric reactions 2H(d,n)3He and 2H(d,p)3H below 5.5 MeV

Analyzing powers for these charge symmetric reactions were measured at low energies where symmetry breaking effects due to the Coulomb interaction should be enhanced. Differences in the magnitudes exist and must be explained if charge symmetry holds; a simple energy shift, proposed earlier, is not adequate for this purpose.     

C~+离子内壳激发共振态1s2s(~3S)2p~3的Auger能量和Auger分支率(英文)

利用精确的鞍点变分波函数和鞍点复数转动方法,计算了C⁺离子五电子原子系统内壳激发共振态1s2s（³S）2p^32,4P°,^2,4D°的俄歇能量和俄歇分支率,考察了俄歇跃迁的收敛性,对300 keV C⁺离子和CH₄气体碰撞实验产生的高分辨率俄歇电子谱进行了标定,并指出这些类硼C⁺离子的内壳激发共振态对253～273 eV范围的实验谱线有重要贡献.本文计算结果与实验数据符合得很好.     

Electronic transition dipole moment functions for transitions among the twenty-six lowest-lying states of Li2

Ab initio electronic transition dipole moment functions are calculated for all dipole-allowed transitions among the 26 states of Li₂ treated by D. D. Konowalow and J. L. Fish (Chem. Phys. 77, 435–448 (1983); Chem. Phys. 84, 463–475 (1984)). Many of the moments exhibit interesting behavior due to charge transfer or ion pair character. Comparisons are made with existing empirical and theoretical determinations of the 1¹Σ_u⁺-1¹Σ_g⁺ and 1¹Π_u-1¹Σ_g⁺ transition moments. The positions of a number of satellite bands are predicted from the potential energy difference curves.     

C+离子内壳激发共振态1s2s(3S)2p3的Auger能量和Auger分支率

利用精确的鞍点变分波函数和鞍点复数转动方法,计算了C+离子五电子原子系统内壳激发共振态1s2s(3S)2p3 2,4Po, 2,4Do 的俄歇能量和俄歇分支率,考察了俄歇跃迁的收敛性,对300-keV C+离子和CH4气体碰撞实验产生的高分辨率俄歇电子谱进行了标定,并指出这些类硼C+离子的内壳激发共振态对253-273eV范围的实验谱线有重要贡献. 本文计算结果与实验数据符合得很好.     

Indirect Study of the 2H(d,p)3H and 2H(d,n)3He Reactions at Astrophysical Energies via the Trojan Horse Method

The ²H(d,p)³H and ²H(d,n)³He reactions have been indirectly studied by means of the Trojan Horse Method applied to the quasi-free ²H(³He, p³H)¹H?²H(³He, n³He)¹H reaction at 18?MeV of beam energy. This is the first experiment where the spectator (here ¹H) has been detected in coincidence with the charged participant, avoiding the limitations of standard neutron detectors. The d ? d relative energy has been measured from 1.5?MeV down to 2?keV, at center of mass angles from 40° to 170°. Indirect angular distributions are compared with the direct behaviour in the overlapping regions.     

The d + d reactions at low energies II. Comparison of angular distributions of outgoing nucleon polarizations for the charge symmetric reactions2H(d,p)3H and2H(d,n)3He

Precision measurement of the angular distribution of polarized protons from the²H(d,p)³H reaction at about 1 MeV is compared with experimental polarization data from the mirror reaction²H(d,n)³He at the same entrance and exit channel energies. In both comparisons, differences in polarizations of outgoing nucleons from the d + d charge symmetric reactions were found to be larger than experimental uncertainties.     

Analysis of the 5d 3-5d 26p transitions in a Hg X ion

Optics and Spectroscopy - Results are presented of an experimental and theoretical analysis of the spectrum of the Hg X ion in the far VUV spectral range. The spectra were excited in the plasma of...     

Study of 2H(d,p)3H and 2H(d,n)3He Nuclear Reactions with Polarized Deuteron Beams. PolFusion Experiment

Physics of Atomic Nuclei - The PolFusion experiment is under preparation at the National Research Center Kurchatov Institute—PNPI, in collaboration with Forschungszentrum Juelich, Germany,...     

E2 transitions between positive- and negative-parity states of the ground-state alternating-parity bands

Experimental transition probabilities between states of the ground-state alternating-parity bands of ¹⁴⁴Ba and their theoretical analysis are presented. Lifetimes of states in ¹⁴⁴Ba have been measured using the recoil distance method following spontaneous fission of ²⁵²Cf. The experiment was performed at the Lawrence Berkeley National Laboratory employing the Gammasphere array and the New Yale Plunger Device. The experimental data show a significantly larger value of the E2 transition probability between the negative-parity states compared to the positive-parity ones. It is shown that this effect can be explained by a higher weight of the deformed component in the wave functions of the odd-I states. In the framework of the cluster approach it is explained by a higher weight of the alpha-cluster component in the wave function of the negative-parity states compared to the positive-parity ones. In the framework of the traditional collective model with the quadrupole and octupole degrees of freedom the same effect is explained by a higher value of the quadrupole deformation at the minima of the potential energy as a function of β₂₀ and β₃₀ compared to its value at the top of the barrier separating two physically equivalent minima, having opposite signs of the octupole deformation. Additionally, the dependence on parity of the E2 transition probability is analyzed qualitatively in nuclei with a minimum at β₃₀ = 0 in the collective potential energy and compared to experimental data for ¹⁴⁸Nd.     

On the degeneracy of the 2H and 2P states from the atomic configuration d3 in the non-relativistic Hartree-Fock approximation

A new relation between the wave functions of the atomic states ²H and ²P arising from the configuration d³ and the wave functions of two molecular states arising from the configuration h³ in icosahedral symmetry molecules is presented. This relation gives an insight into the unknown origin of the non-relativistic Hartree-Fock degeneracy of the atomic states ²H and ²P.     

Quark-antiquark states and their radiative transitions in terms of the spectral integral equation: Charmonia

Earlier by the authors (Yad. Fiz. 70, 68 (2007)), the bƃ states were treated in the framework of the spectral integral equation, together with simultaneous calculations of radiative decays of the considered bottomonia. In the present paper, such a study is carried out for the charmonium states. We reconstruct the interaction in the c-c sector on the basis of the data for the charmonium levels with J _PC = 0⁻⁺, 1⁻⁻, 0⁺⁺, 1⁺⁺, 2⁺⁺, 1⁺⁻ and radiative transitions ψ(2S) → γχ _c0(1P), γχ _c1(1P), γχ _c2(1P), γχ _c(1S) and χ _c0(1P), χ _c1(1P), χ _c2(1P) → γJ/ψ. The c-c levels and their wave functions are calculated for the radial excitations with n ≤ 6. Also, we determine the c-c component of the photon wave function using the e ⁺ e ⁻-annihilation data: e ⁺ e ⁻ → J/ψ(3097), ψ(3686), ψ(3770), ψ(4040), ψ(4160), ψ(4415) and perform the calculations of the partial widths of the two-photon decays for the n = 1 states η _c0(1S), χ _c0(1P), χ _c2(1P) → γγ and n = 2 states η _c0(2S) → γγ, χ _c0(2P) → γγ. We discuss the status of the recently observed c-c states X(3872) and Y(3941): according to our results, the X(3872) can be either χ _c1(2P) or η _c2(1D), while Y(3941) is χ _c2(2P). The text was submitted by the authors in English.     

Hyperfine structure in the 6p5d configuration and isotope shifts in transitions between the 6s5d and the 6p5d configurations in Ba I

High-resolution laser fluorescence spectroscopy, using a single-mode dye laser acting on a collimated atomic beam, has been performed to determine the hyperfine-structure (hfs) constants in six states of the 6p 5d configuration of¹³⁵Ba and¹³⁷Ba. Isotope shifts (IS) for eleven transitions between the 6s 5d and the 6p 5d configurations have also been measured. From an analysis of the energy levels, intermediate angular wavefunctions have been deduced. The wavefunctions are used to evaluate experimental hyperfine parameters from the experimental hfs constants. The parameters are, for the magnetic-dipole interaction compared with theoretical values, and for the electricquadrupole interaction used to estimate the nuclear quadrupole moments for the odd isotopes. The IS in the measured transitions are analysed using a King-plot, with the first resonance line in Ba II as the reference. Specific mass and field shifts are evaluated for the measured transitions. The field shifts have been used to determine the change in mean-square radius between the natural abundant Ba-isotopes.