OPTICAL-OPTICAL DOUBLE-RESONANCE EXCITATION SPECTRA OF THE (6d)1Πg, (7d)1Πg HIGH-LYING RYDBERG STATES IN Na2

Two ¹Π_g states of Na₂ for v≤13 have been observed by using optical-optical double resonance (OODR) fluorescence excitation spectroscopy. The intermediate levels in B¹Π_u state are identified by the numerical calculations with the molec-ular constants for B¹Π_u←X¹Σ_g⁺ transitions and confirmed by the complemen-tary A¹Σ_g⁺←X¹Σ_g⁺ polarization spectra. Absolute vibrational numberings of the (6d)¹Π_g and (7d)¹Π_g states are determined by comparing the experimental OODR excitation intensities with the simulated Franck-Condon factors. The Dnnham coef-ficients and the Rydberg-Klein-Rees (RKR) potential energy curves of the (6d)¹Π_g, (7d)¹Π_g states are reported.     

THE BOUND STATES OF THE ISOBAR △ (1236)

We have discussed the single particle energies and wave functions of a boundisobar in O¹⁶ by using the O¹⁶ equation.     

CW Optical-Optical Double Resonance studies of the 23Πg, 33Πg, 43Πg+, and 13Δg Rydberg states of Na2

The 2³Π_g, 3³Π_g, 4³Σ_g⁺, and 1³Δ_g states of the Na₂ molecule are observed by sub-Doppler Perturbation Facilitated Optical-Optical Double Resonance (PFOODR) spectroscopy. Absolute vibrational assignments and molecular constants are obtained for two of these states (3³Π_g, v = 0–25 observed, and 4³Σ_g⁺, v = 3–5, 13, 14 observed). Tentative vibrational assignments and provisional molecular constants are obtained for the 2³Π_g (v = 43–89 observed) and 1³Δ_g (v = 31–35, 40, 46–51 observed) states. Spin-orbit, spin-spin, and hyperfine splittings are observed. The direct ³Λ_g⁺ → a³Σ_u, 2³Π_g ∼ 3³Π_g perturbation-induced, and collision-induced contributions of these four ³Λ_g states to the ubiquitous Na-vapor violet and ultraviolet emission bands are discussed.     

CS2+( 2Πg )的(1+1)光解离动力学研究

在气束条件下,利用483．2nm的激光（3＋1）共振增强多光子电离（REMPI）CS2分子以产生CS2＋离子源,用另一束可调谐激光在424－482nm内,通过对CS2^+(x^2∏g)(1+1)双光子共振解离产生的碎片离子发谱的探测,来获取CS2^+的光解离动力学信息,光解离碎片S^+的激光发谱（PHOFEX）可归属为CS2^+（A^2∏u,3/2(v′=0-4,v′＝v1_(1/2)v2-)←X^2′∏g,3/2(0,0,0))和（A^2∏u,1/2(v=0-4)←X^2∏g,1/2(0,0,0))跃迁,对CS2^+光解离动力学的研究表明,其产生S^+的通道为：（i)CS2吸收一个光子从基态X^2∏g共振激发至A^-2∏u态,（ii)已布居的A^-2∏u态的振动能级和X^2-∏g态的高振动能级产生耦合,（iii)吸收第二个光子从上述耦合的振动能级进一步激发至B^2∑u^+态,再通过B^-2∑u^+态与^4∑^-态间的自旋－轨道相互作用,经由4∑^-排斥态解离产生S^+_CS。     

THE AVERAGE FIELD OF THE ISOBAR △(1232) IN NUCLEI

The one boson exchange nuclear force is applied to the discussion of the nucleon-△ interaction. The coupling constant is determined by the straton model. Assuming that the wave function is unaltered by the presence of △, we are able to obtain the average field of the isobar in the nuclei approximately. The qualitative feature obtained is that the average field of △ is shallower then that of nueleon by an amount of～15 MeV.     

FINE STRUCTURES OF INCLUSIVE SPECTRA(Ⅰ)——SUM RULES AND THE GENERALIZATION OF FEYNMAN-YANG SCALING

Important implications of the fine structure of inclusive spectra(to be calledinclusive and semi-inclusive spectra of nearby particles,which represent the local dis-tributions of nearby particles in three-dimensional phase space with rapidity y and transverse momenta P_⊥x, P_⊥z as independent coordinates are explained,and some basicfeatures of the fine stucture are found,namely,sum rules and the generalized formof the Feynman-Yang scaling.One of the sum rules,for example,is:where f_(1;k) denotes the normalized invariant inclusive cross section of k closely neigh-boring particles.It follows that the inclusive the spectra of nearby particles arequalitatively different from the usual ones.The generalized form of the Feynman-Yang scaling for the case of k closelyneighboring particles,for example,is:f_(1;k)(s,x₁,P_⊥1,…x_k,P_⊥k⁾∞,（s→∞,x₁≤x₂≤…≤x_k）.where‘∞’denotes‘approaches a definite limit’.For k=2,the existing experimentaldata for the rapidity gap-length distributions show that for FNAL energies,f_(1,k） isalready close to its limiting form.The inclusive（semi-inclusive）spectra of nearbyparticles way be able to reflect effectively short-range correlation effects.     

Electronic spectra of XeNe molecules in the range 77100-90100 cm-1 near Xe* (6p, 5d, 6p’, 7s, 7p, 6d) obtained by the (3 + 1) REMPI and (2 + 1) REMPI methods

The electronic spectra of XeNe molecules in the range of 77100-90100 cm^-1 are measured by the method of laser resonance multiphoton ionization in a supersonic jet. The photoionization spectra are obtained upon two- and three-photon excitations of molecules and their ionization by the next photon. In the range of 80300-90100 cm^-1 near Xe*(5d, 6p’, 6d, 7s, and 7p), the spectra are obtained for the first time. A whole number of vibrational systems are measured in this range. The majority of vibrational systems near Xe* (5d, 6d, 7p, and 7s) are located in the red range with respect to their dissociation limits. In the blue range with respect to the dissociation limits, continua corresponding to transitions of molecules from the ground state to repulsive potential curves of excited states are detected. For a number of excited states of XeNe molecules, the vibrational analysis is performed and molecular constants are estimated.     

EXPANSION OF RADIAL WAVE FUNCTION OF d OR f ELECTRONS AND THE SHIFTS OF CRYSTAL FIELD SPECTRA+ Ⅱ. RUBY FLUORESCENCE R1 LINE

By analysing the characters of R1 transition energy, starting from a general theory, the relation between red shift Δλ/λ₀ and expansion function φ(K) is derived. The explicit expressionsof φ(K) and available over a wide range of pressure are obtained. The pressurey vs. compression ratio relation P-K is calculated by using Birch equation. The red shifts are calculated upto 1.7mbar.The agreement with experimental data is satisfactory. Finally, the results are dis-cussed.     

THE SUPERCONDUCTIVITY IN Al-DOPEDY_(1-x)Al_xBa_2Cu_3O_y

本文系统地分析了在Ｙ１－ｘＡｌｘＢａ２Ｃｕ３Ｏｙ（ｘ＝０～０．７）中用Ａｌ替代Ｙ的替代效应．我们发现当ｘ＜０．４时，Ａｌ主要替代在Ｙ位，引起结构畸变，从而导致氧含量的减少和Ｏ－Ｔ相变，转变温度随Ａｌ含量增加而下降．当掺杂量大于０．４，Ａｌ开始占据Ｃｕ（１）和Ｃｕ（２）位，样品变为四方结构，Ｔｃ迅速下降．ＸＰＳ分析表明，Ａｌ的位置依赖于掺杂量，随掺杂浓度的增加Ａｌ依次替代Ｙ，Ｃｕ（１），Ｃｕ（２）．同时我们观察到Ｔｃ和ＣｕＯ２平面间相互作用的正比关系．     

PHASE TRANSITIONS IN Bi2Sr2(Cu1-zFez)O6+δ

We have investigated, by X-ray diffraction, a series of single crystals of Bi-based oxides with the nominal composition Bi₂Sr₂(Cu_1-zFe_z)O_6+δ(0≤z≤0.55). In this system we observed two structural phase transitions with the increase of the doping content. The first transition, from an incommensurate monoclinic phase to an incommensurate orthorhombic phase, occurs at a doping content of iron z_Fe=0.027. The second one corresponds to a phase transition from an incommensurate orthorhombic phase to a commensurate orthorhombic phase at z_Fe=0.34. The comparison of these results with those for more limited substitutions of Zn and Ni indicates the significant role of the insertion of the extra oxygen in the (Bi-O)_∞ double layers.     

钡钇氟化物中Eu2+离子的激发光谱和发射光谱

在298和77K下分别研究BaYF5(BaF2·YF3)中Eu2+的激发和发射光谱。Eu2+的发射光谱中,除了一个属5d-4f跃迁的宽发射带外,还有一组6PJ→8S7/2的4f-4f跃迁窄谱线发射。它们的发射强度与Eu2+的浓度和温度有关。由於Eu2+从4f7基态跃迁到4f65d1态产生两个宽的激发带,4f65d(eg)和4f65d(t2g)。实验证实,Eu2+的6PJ→8S7/2的窄谱线发射主要来自高能级的t2g激发能弛豫的结果。     

双相干态光场与原子依赖强度耦合过程的腔场谱

研究了依赖强度耦合双模J-C模型的腔场谱,给出了激发态原子与双相干态光场双光子共振相互作用过程光谱结构的数值结果.发现腔场谱呈现出复杂的多峰结构.腔场谱的频率灵敏地受两模光子数差q的调谐.     

C2H2分子受激Raman光谱中的光学Stark效应研究

本文研究了C₂H₂分子受激Raman光谱(SRS)中的光学斯塔克(Stark)效应,同时还研究了激光功率以及单一转动态量子数J与Stark效应的关系.实验表明:C₂H₂分子在高强度激光电场作用下,它的SRS由于光学Stark效应产生明显的非对称加宽,利用Stark线型加宽数值模拟,从理论上计算了Raman光谱线型,与实验的SRS线型比较,二者符合程度相当好.     

EXCITATION ENERGIES OF 1s2nd AND 1s2nf STATES FOR THE LITHIUM ISOELECTRONIC SEQUENCE

The nonrelativistic energies of the 1s²nd and 1s²nf(n=6, 7, 8 and 9) states for the lithium isoelectronic sequence from Li I to Ne VⅢ are calculated by using a full core plus correlation method with multiconfiguration interaction wave function. Relativistic and mass-polarization effects on the energy are evaluated as the first-order pertur bation theory. In most cases with nuclear charge, Z≤7, the agreement between our predicted excitation energies and the experimental data is less than 1cm^-1.     

PATH INTEGRAL IN CORRELATED EIGENSTATE BASIS OF COMPLEX SCALAR FIELDS φ(x) AND φ?(x)

Using the technique of integration within an ordered product of operators, we construct a new common eigenvector set of the complex scalar fields φ(x) and φ^?(x), which is a set of particle-antiparticle correlated states. On the basis of the new eigenstates we develop the path integral formuation. The new eigenvectors' properties are investigated, they are qualified to be a new representation.     

强激光场中双原子分子多光子激发的李代数方法

用“模拟势－李代数”方法研究了双原子分子在强激光场中的多光子振动激发，计算了跃迁几率与外场频率、时间的关系，讨论了有两个激光场时跃迁儿率所受的影响． 关键词：     

A STUDY OF RAMAN SCATTERING AND INFRARED ABSORPTION SPECTRUM IN A NEW SERIES OF MERCURY-BASED HIGH-Tc SUPERCONDUCTOR (Hg,Mo)Sr2(Y1-xCax)Cu2O6+δ

Lattice vibrations of the (Hg,Mo)Sr₂(Y_1-xCa_x)Cu₂O_6+δ—a new series of mercury-based high-T_c superconductor are analyzed with the aid ofgroup theory. The vibrations of species are given. They are 4A_1g+ B_1g+ 5E_g+ 7A_2u + B_2u+ 8E_u. The 4A_1g, B_1g and 5E_g modes are Ramma active, the 6A_2u and 7E_u are infrared active. Phonon vibration characteristics of the samples are studied using Raman scattering and infrared absorption spectra. The experimental results show that the typical phonon vibrational modes appear mainly at 145, 320, 440, 578, 592 and 645cm^-1, The intensities of the 145, 320, 440, 578 and 645 peaks decrease with increasing Ca content x and the position of 645 peak moves to higher wavenumber slightly. In this article, the phonan modes are assigned and their variation behavior with increasing Ca content x are discussed.     

THE OCCUPATION FUNCTION OF LOCALIZED STATES IN AMORPHOUS SEMICONDUCTORS CALCULATED FROM THE ENTI RE TRANSIENT PHOTOCURRENT SPECTRA

The occupation function of localized states in amorphous semiconductors is calculated from the entire transient photocurrent spectra. We find that the occupation function does not exhibit any abrupt change for the observation time shorter and longer than the monoqlecular recombination lifetime τ_MR. This result is opposed to previous conclusion. Our'result is independent of the specific shape of. the density of localized states.     

氯化苯并咪唑镧的荧光光谱

对新合成的化合物氯化苯并咪唑镧HCl₄·[C₇H₆N₂(H₂O)₂]₂La及其LaCl₃·5H₂O的水溶液进行了三维荧光光谱测定,讨论了HCl₄·[C₇H₆N₂(H₂O)₂]₂La在不同波长的光激发下的荧光特性,荧光强度与浓度的关系及标题化合物的上转换荧光,即在540nm绿光的激发下可以获得紫外光(290nm)和近紫外光(360nm).