1S0 and 3S13D1 nucleon-nucleon potentials in the quark compound bag model

For nucleons interacting via formation of the quark compound bag the resulting potential is written in a general form. Explicit examples of potentials are constructed in the ¹S₀, ³S₁ and ³S₁-³D₁ states fitted to the experimental data at T_L ? 1 GeV. As an outcome the QCB energy levels (dibaryons) and NN admixture in QCB are obtained in good agreement with theoretical predictions.     

Regarding the 21S0 and 23S1 multiplets

<正>This paper discusses the masses and possible members of 2¹S₀ and 2³S₁ meson multiplets in the framework of meson-meson mixing and Regge phenomenology.For the 2¹S₀ meson nonet,K^*（1460） may be the observed state of the 2¹S₀ isodoublet with a mass of 1400 MeV and the mass ofω（1420） is 1412 MeV.For the 2³S₁ meson nonet,K^*（1410） seems too light to be the 2³S₁ ns member.The fact that the agreement between the present findings and those given by experiments and other different approaches is satisfactory implies that the assignments in this paper may be reasonable.     

Ba原子6s6p1P1←6s6s1S0跃迁的光腔衰荡光谱

建立了一套光腔衰荡原子束吸收光谱测量装置,并对Ba原子的6s6p¹P₁←6s6s¹S₀吸收谱线用光腔衰荡光谱方法进行了测量,得到了Ba原子在553.548nm不同温度下的吸收谱线线型.实验结果表明,该装置测量吸收灵敏度达到6×10^-7. 关键词： 光腔衰荡 吸收光谱 Ba原子     

Lifetimes of the Si I 3p4s 1P1 and 3p3d 1P1 states

A beam of metastable silicon atoms was produced by collisional dissociation of silicon molecules and selectively excited by a pulsed dye laser. The lifetimes of the excited Si I states were directly determined from the fluorescence decay curve: $\text{τ(3p4s}{}^1\text{P}{}_1\text{) = 4.1 (4) ns}$, $\text{τ(3p4s}{}^3\text{P}{}_2\text{) = 4.4 (4) ns}$, $\text{τ(3p3d}{}^1\text{P}{}_1\text{) = 8.1(5) ns}$.     

Relativistic calculations of 3s2 1S0-3s3p 1P1 and 3s2 1S0-3s3p 3P1,2 transition probabilities in the Mg isoelectronic sequence

Using the multi-configuration Dirac-Fock self-consistent field method and the relativistic configuration-interaction method,calculations of transition energies,oscillator strengths and rates are performed for the 3s 2 1 S 0-3s3p 1 P 1 spinallowed transition,3s 2 1 S 0-3s3p 3 P 1,2 intercombination and magnetic quadrupole transition in the Mg isoelectronic sequence(Mg I,Al II,Si III,P IV and S V).Electron correlations are treated adequately,including intravalence electron correlations.The influence of the Breit interaction on oscillator strengths and transition energies are investigated.Quantum electrodynamics corrections are added as corrections.The calculation results are found to be in good agreement with the experimental data and other theoretical calculations.     

Charmonium-the 1P1 state

Based on a model which gives agreement with the observed hyperfine and fine splitting of the charmonium states, we predict the mass of ¹p₁ to be 3372 MeV, substantially lower than any previous predicted values. We have also estimated branching ratios and decay rates for the production of this state via channels which become accessible because of its low mass.     

Faddeev πNN dynamics with ρ-exchange contribution for the 1D2 and 3F3 diproton anomalies

The ¹D₂ and ³F₃ diproton anomalies are studied in a framework of Faddeev πNN dynamics with ρ-exchange contribution. Two-body interactions in πN-P₃₃, πN-P₁₁, NN-³P₂; and NN-³Si₁ states are input. The pp-pp, pp-πd and πd-πd processes are treated in a unified way and the results are compared with partial wave analysis results of each process. The ¹D₂ and ³F₃ diproton anomalies are qualitatively explained by the present models. The ρ-contributions are remarkable in the amplitudes of pp-pp and pp-πd processes from the pp-¹D₂ state.     

Durees de vie des niveaux 1D2 ET 1S0 du magnesium

Radiative lifetimes of the excited n¹S₀ (n = 4, 5) and n¹D₂ (n = 3, 4) states in magnesium have been measured by time resolved fluorescence technique using two photon excitation.     

The microwave spectrum of 14NH3 in the v = 000011 state

The frequencies and assignments of 50 lines in the pure inversion spectrum of ¹⁴NH₃ in the 0001¹ vibrational state are reported in the microwave frequency region 18–53 GHz and in selected regions up to 58 GHz.The J = 0 inversion frequency, K-type doubling constant K, l = 2, ?1 and molecular dipole moment in this state are 32 904.7 ± 2.0 MHz, 1.958 ± 0.040 MHz and 1.459 ± 0.002 D, respectively, where model inadequacies are included in the uncertainties of the first two parameters. The dipole moment measurements for this and the ground state are in excellent agreement with Stark laser measurements. An expression containing the effective l-type doubling constant is obtained from the combination of frequencies $\text{[ν(1, 1, 1) ? ν(1, 1, ?1) ? ν(2, 1, 1) + ν(2, 1, ?1)]}\text{8}\text{= 10 361.894 ± 0.004}\text{MHz}$. A preliminary value for the l-type doubling constant is 10 655 ± 20 MHz.     

OCS分子在128 nm附近的光解动力学研究：S(3PJ=2,1,0)、S(1D2)以及S(1S0)产物通道

本文利用时间切片离子成像技术对OCS分子进行了真空紫外波段的光解动力学研究. 在四个光解光波长(从129.32到126.08 nm)下测量了硫原子解离产物S(³P_J=2,1,0)、S(¹D₂)、S(¹S₀)的速度影像，并从中清晰地发现了四个主要的解离产物通道：S(³P_J=2,1,0)+CO(X¹Σ⁺)，S(³P_J=2,1,0)+CO(A³π)，S(¹D₂)+CO(X¹Σ⁺)和S(¹S₀)+CO(X¹Σ⁺). 在实验影像中，产物CO分子的部分振动态结构能够得到分辨. 实验还获取解离产物总平动能谱，产物分支比和角分布. 对实验结果进行分析显示除绝热解离通道S(³P_J=2,1,0)+CO(A³π)之外，在其他三个产物通道中非绝热效应都起到非常重要的作用.     

Pressure broadening studies on the 33D1-2 3P0 helium line by saturated-absorption techniques

Broadening and shift measurements on the 3³D₁?2³P₀ component of the helium line at λ=587.5 nm are reported. The saturated-absorption method is used. Measurements are performed at room temperature and at liquid nitrogen temperature. Homogeneous broadening constants are deduced from an analysis taking into account the effect of weak velocity-changing collisions. Broadening and shift constants are interpreted in term of a Lennard-Jones interaction potential. The very small shifts observed show the predominance of the repulsive core effect in the interaction potential.     

Measurement and analysis of the ν2 bands of 14ND3 and 15ND3

The ν₂ fundamentals of ¹⁴ND₃ and ¹⁵ND₃ have been observed with sufficient resolution to resolve many of the individual P, Q, and R lines for both components of the inversion doublet. With the help of the observed intensity alterations assignments of many of the lines were made. A least-squares analysis was applied to determine the various vibration-rotation constants pertinent for these transitions. The ¹⁴N¹⁵N isotope shift is found to be ?6.2 cm^?1.     

The origin of K2, Rb2 and Cs2 triplet 13Πg−X3Σ+u bands in discharge

The absorption and emission spectra of potassium, rubidium and caesium low-pressure discharges have been studied at the far blue wings of resonance D2-lines. The observed diffuse bands were attributed to the 1³Π_g?X³Σ⁺_u transition. Experiments revealed the recombination ²P + ²S nature of these bands, and the corresponding rate coefficients were obtained. Energies of the higher excited states as well as the X³Σ⁺_u -state well depths for K₂, Rb₂ and Cs₂ molecules were estimated.     

The diode laser spectrum of the ν2 band of 14ND3 and 15ND3

The spectra of the ν₂ bands of ¹⁴ND₃ and ¹⁵ND₃ were measured under Doppler-limited resolution with a diode laser spectrometer in order to resolve the K structure of the sR(J, K) and aR(J, K) multiplets. By a simultaneous least-squares analysis of these data, the Fourier spectra of the ν₂ band measured by Jones [J. Mol. Spectrosc.74, 409 (1979)], and the ground-state microwave transitions, sets of improved ν₂-band parameters were obtained, including the sextic centrifugal distortion coefficients.     

The vibrational transition moment for the ν2 bands of 14ND3 and 15ND3

Intensities were measured at high pressure (200 Torr) for blended K-multiplets in the P and R branches of the s0 → aν₂ and a0 → sν₂ bands of ¹⁴ND₃. Intensities of 55 individual lines at 10 Torr of ¹⁵ND₃ were also measured by deconvolution of the true line shape from the observed vibration-rotation spectrum and the instrumental line shape. From these results we estimate a transition moment of 0.179 ± 0.010 D for both ¹⁴ND₃ and ¹⁵ND₃. These lead to a derivative of the dipole moment, $\text{|}\text{?μ}\text{?Q}{}_2\text{| = 93}\text{cm}{}^{\mathrm{<mtext>3</mtext><mtext>2</mtext>}}\text{sec}{}^{\mathrm{?1}}$.     

钠双原子分子2~3∏_u→1~3∑~＋_g跃迁近红外发射光谱

用紫外激光泵浦Ｎａ２分子高位电子态，观察到了位于０．９８１．０４μｍ谱区峰值在１．０μｍ附近的近红外发射谱，判断其来源于单三重态分子间能量转移后的２３∏ｕ→１３∑＋ｇ跃迁。     

Ni^2＋：LiNbO3的光学吸收谱和EPR的研究

应用三角晶场中d^2(d^8)电子组态的包括静电相互作用和自旋－轨道耦合相综合利用物强场能量矩阵,采用完全对角化方法,精确地计算了具有C3V对称的Ni^2 :LiNbO3的光学吸收谱和EPR谱。理论结果与实验值符合得很好。     

A new emission of ZnS:Ni2+ arising from the 3T1(P) → 3T1(F) transition

A photoluminescence band with zero-phonon transitions at $\text{?}\text{= 12438 cm}{}^{-1}$ (this one subject to self-absorption) and at 12259 cm^-1 has been detected with ZnS:Ni crystals. Based on the appearance of these two lines, on the similarity of the whole spectrum with the ³T₂(F) → ³T₁(F) Ni²⁺ luminescence, and on preparation evidence, this new emission is interpreted as the ³T₁(P) → ³T₁(F) transition of substitutional Ni²⁺(3d⁸) ions in a tetrahedral crystal field.     

Spectral intensities in the ν3 bands of 12CH4 and 13CH4

Relative and absolute line intensities for the ν₃ bands of the ¹²C and ¹³C isotopic varieties of methane have been measured using a tunable difference-frequency laser spectrometer. From these data the integrated band strength of ¹³CH₄ is calculated to be 0.983 ± 0.007 that of ¹²CH₄, with the uncertainty representing three standard deviations. The absolute ν₃ bandstrength for ¹²CH₄ is 266.1 ± 3.0 cm^?2 atm ^?1 at 294.7 K where the errors are dominated by the pressure measurement. This band strength corresponds to an effective transition moment 〈μ₃〉 = 0.0534(3)D for ¹²CH₄ from which the ν₄ band dipole moment and the Herman-Wallis F factor can be estimated using a recent force field model for methane.