Investigation of pulsed laser ablation process of Hg_(0.8)Cd_(0.2)Te

The vaporization threshold was measured under the irradiation of 1.064-μm,10-ns pulsed laser.Then we calculated the vaporization temperature based on the conservation law of energy and analyzed the vaporization time based on our established model.These results coincided well with the information from the micrograph of scanning electron microscope(SEM)and the spectra of the plasma.Besides,the laser ablation rate was also computed and discussed theoretically.     

Irreducible Representation of Quantum SLq(3) Algebra (Ⅰ)

The explicit forms of the irreducible representation matricea for the quantum SLq(3) enveloping algebra are computed in analogy to the irreducible tensor technique in the classical SU(3) algebra.     

Irreducible Representation of Quantum SLq(3) Algebra(Ⅱ)

The explicit forms of the Clebech-Gordan coefficients for the quantum algebra SLq(3) are computed by our technique preeented in part Ⅰ.     

Strong decays ofΨ(4.03) andΨ(4.16) as radial excitations of charmonium

Considering the signals detected at 4.03 and 4.16 GeV as radial excitations of charmonium, we study their relative decay rates intoD \(\bar D\) ,D \(\bar D^* \) ,D ^* \(\bar D\) ,D ^* \(\bar D^* \) . We point out that one can understand these two peaks as ac \(\bar c\) 3S?2D wave state system with a large mixing angle in a Coulomb+linear interquark potential. We also examine the possibility that these two signals are respectively 3S and 4S wave excitations by studying a logarithmic charmonium potential model. We show that both these interpretations lead to drastically different predictions for the Ψ (4.16) decay rates (eitherD \(\bar D^* \) +D ^* \(\bar D\) orD \(\bar D\) mode is strongly suppressed) which would be very instructive to test experimentally.     

Absolute Intensities of the 10-µm Bands of (16)O(3)

Two hundred ninety experimental absolute intensities of nu(1) and nu(3) transitions of ozone have been measured, with good accuracy (<2%). They are used to derive the transition-moment parameters for these bands. The agreement between our observed and calculated line intensities is satisfactory. This work shows that the intensities of these two bands are on average 4% smaller than those used in the literature. In addition, 20 intensities of the nu(2) + nu(3) - nu(2) band confirm this value. Also, 42 line intensities of the 2nu(1)-nu(3) band are reported. Copyright 2001 Academic Press.     

Thermal equation of state of goethite (α-FeOOH)

ABSTRACT

The pressure–volume–temperature (P–V–T) equation of state (EoS) of natural goethite (α-FeOOH) has been determined by an X-ray diffraction study using synchrotron radiation. Fitting the volume data to the third-order Birch–Murnaghan EoS yielded an isothermal bulk modulus, B₀ of 85.9(15)?GPa, and a pressure derivative of the bulk modulus, B′, of 12.6(8). The temperature derivative of the bulk modulus, (?B/?T)_P, was –0.022(9)?GPa?K^?1. The thermal expansion coefficient α₀ was determined to be 4.0(5)?×?10^?5?K^?1.     

Dispersive Contribution of ρ(1450,1700) Decays and X(1576)

We study whether the broad enhancement X（1576） arises from the final state interaction （FSI） of p（1450, 1700）→p^＋ p^- →K^＋ K^-decay,Both the absorptive and dispersive contributions of the above amplitudes are considered since the intermediate states are very close to p（1450, 1700）. AThe same mechanism leads to a similar enhancement around 1580 MeV in the π^＋ π^- specturm in the J/ψ →π^0 π^＋ π^- channel, which can be used to test whether X（1576） can be ascribed to the FSI effect ofp（1450, 1700） → p^＋ p^-.     

Production of P_(cs) (4459) from Ξ_b Decay

Inspired by the P_(cs)(4459) reported by the LHCb collaboration recently,we investigate the P_(cs)(4459) production from Ξ_b decay in a molecular scenario using an effective Lagrangian approach.With different J~P assignments to P_(cs)(4459),the magnitude of branching fractions of Ξ_b→ P_(cs)(4459)K is estimated,which is of the order of 10-4.Together with the decay properties of P_(cs)(4459),the present estimations could be further testified by precise measurements and contribute to a better understanding of the molecular interpretations and the exploration of J~P quantum numbers of P_(cs)(4459).     

A Study of Electromagnetic Transition of △(1232) Resonance

Point form relativistic dynamics of relativistic quantum mechanics is employed to estimate the photon and electroproduction amplitudes of △(1232) resonance. Results are compared with the non-relativistic work, and the differences between the two frame works are discussed.     

Analyticity of solutions of theO(N) nonlinear σ-model

We consider continuous weak solutions of the Euler-Lagrange equation associated with the Euclideand-dimensionalO(N) nonlinear -model. We show for arbitraryN and arbitraryd that such solutions with locally square integrable gradient are real analytic.     

Abnormal Suppression of Vector-Tensor Decays of ψ(2S)

The hadronic decays ψ(2S)→ρα₂ and K^*0K₂^*0+c.c. have been studied in a sample of 3.6×10⁶ ψ(2S) events.Measurements of their branching fractions are presented.Both channels violate the “15% rule” predicted by perturbative QCD compared with the corresponding J/ψ decays.These results serve as new examples of abnormal suppression of ψ(2S) decays into vector-tensor final states that was first observed in ψ(2S)→ωf₂     

A simulation study of rapid solidification and crystal configuration of Cu_(70)Ni_(30) alloy

1 Introduction It is well known that the performances of metal materials are mainly determined by their special microcosmic configuration formed in the concreting processes. For under- standing the relationship between the configuration and performance, it is very impor- tant both in theory and practice to find out the form and transition feature of microcos- mic configuration by tracking the concreting processes of liquid metals. Cu-Ni alloy is a completely solid solution or a single-phase al…     

h-Deformation of GL(1∣1)

An h-deformation of a (graded) Hopf algebra of functions on supergroup GL(11) is introduced via a contraction of GL _q (11). The deformation parameter h is odd (Grassmann). A related differential calculus on h-superplane is presented.     

Chinese Journal of Spectroscopy Laboratory( CJSL)

Chinese Journal of Spectroscopy L aboratory is one of the academic journalsof the Chinese Academy ofSciences.It is distributed at home and abroad. First published in 1 984,it is jointly managed byInstitute of Chemical Metallurgy,the Chinese Academy of Sciences,Beijing Central Research Instituteof Iron and Steel and Beijing Institute of Aeronautical Materials etc.Chinese Journal of Spectroscopy L aboratory is published bi-monthly with around 2 0 0 thousandsChinese words each issue. T…     

Chinese Journal of Spectroscopy Laboratory(CJSL)

ISSN10 0 4-8138CN11-315 7/O4Chinese Journal of Spectroscopy L aboratory is one of the academic journals of the Chinese Academyof Sciences.It is distributed at home and abroad.First published in1 984,it is jointly managed byInstitute of Chemical Metallurgy,the Chinese Academy of Sciences,Beijing Central ResearchInstitute of Iron and Steel and Beijing Institute of Aeronautical Materials etc.Chinese Journal of Spectroscopy L aboratory is published bi-monthly with around 2 0 0 thousan…     

Thermodynamics of poly(α-olefin) solutions

The Maron theory of polymer solutions was used to examine the 30°C vapor pressure data of Tait and Livesey on solutions of polyheptene-1, polydecene-1, polydodecene-1, and polyoctadecene-1 in toluene. For polyheptene-1 and polydecene-1, excellent agreement was obtained between theory and experiment over the entire concentration range studied. However, for the other two polymers, deviations were observed between the calculated and observed vapor pressures at higher solution concentrations. These deviations were used to show the presence of crystallinity in these and to ascertain the amounts. Further, it was shown that only one crystalline form of the polymer was present in the polydodecene-1, whereas in the polyoctadecene-1 two crystalline forms were detected. These observations, confirmed by measurements with a differential thermal analyzer (DTA), indicate that for polydodecene-1 and one of the crystalline forms in polyoctadecene-1 the crystallization involves alignment of both backbone and side chains; however, the lower melting form in polyoctadecene-1 appears to have only the side chains aligned in the crystal lattice.     

Synthesis and Reactivity of Mg(II)–Fe(II)–Fe(III) Hydroxycarbonates

Green rust-like compounds (GRs) were discovered as natural minerals in various hydromorphic soils, where anoxic conditions allow their stability. They may control some redox processes in aquifers and participate to the transformation of various pollutants. Since Mg(II) cations are present in the fields where GRs were discovered, a partial substitution of Mg(II) to Fe(II) leading to intermediate compounds between GRs and usual Mg(II)–Fe(III) hydroxysalts is suspected. Mg(II)–Fe(II)–Fe(II) hydroxycarbonates can be obtained as intermediate oxidation products of (Mg, Fe)(OH)₂ in carbonate-containing aqueous media obeying to [Fe^II _4(1–x)Mg^II _4x Fe^III ₂(OH)₁₂]²⁺ [CO₃ ^2– nH₂O]^–2. TMS spectra at 12 K are similar to those of GRs, i.e., two quadrupole doublets, one due to Fe(II) with a large isomer shift =1.29 mms^–1 (with respect to -iron at room temperature) and quadrupole splitting E _Q=2.76 mms^–1, the other one due to Fe(III) with smaller hyperfine parameters =0.49 mms^–1 and E _Q=0.44 mms^–1. Fe(II) ions oxidise rapidly into Fe(III) with dissolved O₂. The reactivity is similar to that of Fe(II)–Fe(III) hydroxysalts GR, and thus the potential of Mg(II)–Fe(II)–Fe(III) compounds for reducing pollutants.     

Chinese Journal of Spectroscopy Laboratory(CJSL)

ISSN1 0 0 4- 81 38CN1 1 - 31 5 7/ O4Chinese Journal of Spectroscopy L aboratory is one of the academic journals of the ChineseAcademy of Sciences.It is distributed at home and abroad.First published in1 984,it is jointlymanaged by Institute of Chemical Metallurgy,the Chinese Academy of Sciences,Beijing CentralReaserch Institute of Iron and Steel and Beijing Institute of Aeronautical Materials etc.Chinese Journal of Spectroscopy L aboratory is published bi-monthly with around2 0 0 …     

Chinese Journal of Spectroscopy Laboratory(CJSL)

ISSN10 0 4- 8138CN11- 315 7/O4Chinese Journal of Spectroscopy Laboratory is one of the academic journals of the ChineseAcademy of Sciences.It is distributed at home and abroad.First published in1984,it is jointlymanaged by Institute of Chemical Metallurgy,the Chinese Academy of Sciences,Beijing CentralReaserch Institute of Iron and Steel and Beijing Institute of Aeronautical Materials etc.Chinese Journal of Spectroscopy Laboratory is published bi- monthly with around2 0 0 thousand…     

Evidence of Vibrational-Induced Rotational Axis Switching for HD(12)C(16)O: New High-Resolution Analysis of the nu(5) and nu(6) Bands and First Analysis of the nu(4) Band (10-µm Region)

Using new high-resolution Fourier transform spectra recorded in Giessen in the 8-12 μm region, a more extended analysis of the nu(5) and nu(6) bands and the first high-resolution study of the nu(4) band of HDCO were performed. As pointed out previously [M. Allegrini, J. W. C. Johns, and A. R. W. McKellar, Can. J. Phys. 56, 859-864 (1978)], the energy levels of the 5(1) and 6(1) states are strongly coupled by A- and B-type Coriolis interactions. On the other hand, it appeared that weaker resonances involving the energy levels of the 4(1) state with those of the 5(1) and 6(1) states also had to be accounted for. Consequently, the calculation of the energy levels was performed taking into account the Coriolis-type resonances linking the energy levels of the {6(1), 5(1), 4(1)} resonating states. Because of the unusually strong Coriolis interaction between nu(5) and nu(6), a nonclassical behavior of the rotational levels of the 5(1) and 6(1) states was observed and it was necessary to use a new Hamiltonian matrix which possesses, as usual, both A- and B-type Coriolis operators in the 5(1) if 6(1) and 6(1) if 4(1) off diagonal blocks but differs from the classical reduced Hamiltonian which is used commonly for planar C(s)-type molecules. More precisely, it proved necessary to include non-orthorhombic terms in the expansion of the rotational Hamiltonian of the 5(1) and 6(1) states. According to the considerations developed by Watson [J. K. G. Watson, in "Vibrational Spectra and Structure," (J. Durig, Ed.), Chap. 1, Elsevier, Amsterdam, 1977], these non-orthorhombic operators which are not symmetry forbidden are usually removed for semirigid C(s)-type molecules by rotational contact transformations. In the present study, the occurrence of terms in {J(x), J(z)} in the expansions of the rotational Hamiltonians for the 5(1) and 6(1) states indicates that the inertial system of HDCO differs for each of the three {6(1), 5(1), 4(1)} resonating states. Therefore, HDCO becomes a good example of vibrational-induced rotational axis switching (VIRAS) which was already suggested as the mechanism responsible for the enhanced densities of coupled states observed in 2-fluoroethanol [H. Li, S. Erza, and L. A. Philips, J. Chem. Phys. 97, 5956-5963 (1992)]. Copyright 2000 Academic Press.