首页 | 本学科首页   官方微博 | 高级检索  
相似文献
 共查询到20条相似文献,搜索用时 15 毫秒
1.
2.
The emission spectrum of the B2Σ+-X2Σ+ (First Negative) system of the molecular ion 12C18O+ have been photographed at a resolution sufficient to observe the spin splitting of the lines with N > 18. Four bands, 0-1, 0-3, 1-4 and 2-5, have been rotationally analyzed and the molecular constants of the B2Σ+ , v = 0,1, 2 and X2Σ+ , v =1, 3, 4, 5 have been obtained.  相似文献   

3.
4.
5.
The effects of isotope substitution on stereodynamic properties for the reactions C~+ + H_2/HD/HT →CH~+ + H/D/T have been studied applying a quasi classical trajectory method occurring on the new ground state CH_2~+ potential energy surface [J. Chem. Phys. 142(2015) 124302]. In the center of mass coordinates applying the quasi classical trajectory method to investigate the orientation and the alignment of the product molecule. Differential cross section and three angle distribution functions P(θ_r), P(ф_r), P(θ_r, ф_r) on the potential energy surface that fixed the collision energy with a value is 40 kcal/mol have been studied. The isotope effect becomes more and more important with the reagent molecules H_2 changing into HD and HT. P(θ_r, ф_r) as the joint probability density function of both polar angles θ_r and ф_r, which can illustrate more detailed dynamics information. The isotope effect is obvious influence on the properties of stereodynamics in the reactions of C~+ + H_2/HD/HT → CH~+ + H/D/T.  相似文献   

6.
T-odd correlations that are possible in the processes n + p d + and n + p d + e+ + ee- and that arise due to the capture of thermal neutrons are determined in terms of threshold amplitudes (for the process n + p d + @#@) or electromagnetic inelastic form factors (for the process n + p d+ e+ + ee§-). The mechanism of these reactions is not given in concrete form, but those general properties of the electromagnetic hadronic current are used that are preserved with three-dimensional reflections.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 10, pp. 8–13, October, 1986.  相似文献   

7.
8.
ABSTRACT

High-resolution emission spectrum of the 1–4 band of the B 2Σ+X 2Σ+ transition of 14C16O+ was observed for the first time by conventional emission spectroscopy. The band spectrum was excited in a water-cooled Geissler lamp filled with commercial gaseous carbon monoxide enriched in about 80% of the radiocarbon 14C. A rotational analysis has been carried out and obtained molecular constants have been merged with previously published data for the B 2Σ+A 2Πi and A 2ΠiX 2Σ+ transitions. The principal equilibrium constants for the ground X 2Σ+ state obtained from this work are ωe = 2121.7726(98), ωe x e = 13.9055(27), B e = 1.815290(30), αe = 1.6594(33) × 10?2, and γe = ? 0.377(73) × 10?4 cm?1. Also, presently known experimental equilibrium molecular constants of the X 2Σ+ states of the CO+ isotopic molecules are summarized and isotopic dependence of the B e and ω e constants is discussed.  相似文献   

9.
10.
李淑娟  石英  解廷献  金明星 《中国物理 B》2012,21(1):13401-013401
We investigate the influence of reagent vibration on the stereodynamics of the title reaction by the quasi-classical trajectory on the Aguado-Paniagua2-potential energy surface developed by Aguado et al. (J. Chem. Phys. 1997 106 1013). The cross sections and reaction probability as functions of the reagent vibration are calculated in the centre-of-mass frame. The product angular distributions of p(θr), p(φr), and p(θr, φr), which reflect the vector correlation, are also presented and discussed. The results indicate that the vector properties are sensitively affected by the vibrational excitation.  相似文献   

11.
The "good" diquark is employed to study Λ_c~+ baryons within a mass loaded flux tube model. The study indicates that all Λ_c~+ baryons candidates in the 2008 review by the Particle Data Group (PDG) are well described in the mass loaded flux model. The quantum numbers J~P of these Λ_c~+ candidates are assigned. If Λ_c(2765)~+ is an orbitally excited Λ_c~+, it is likely the J~P=3~+/2 one. If Λ_c(2765)~+ is an orbitally excited Σ_c, there ought to be another J~P = 3~+/2 Λ_c~+ with mass ≈ 2770 MeV. In the model, there exists no J~P = 1~+/2 Λ_c~+ (≈ 2700) predicted in existing literature. Λ_c(2940)~+ is very possible the orbitally excited baryon with J~P = 5~-/2.  相似文献   

12.
The facilities of the coherent laser pulse spectroscopy of the ¯pHe+ transitions are considered taking the magnetic structure of the energy levels into account. The possibility for the observation of the dynamics of intramolecular motions is also analyzed.  相似文献   

13.
The First Negative bands of 12C16O+ and 13C16O+, in the spectral region 40 000–46 000 cm−1, have been photographed at a resolution sufficient to resolve the spin-doubled components. These data for 12C16O+, along with previously reported data of the same transitions, as well as microwave transitions of 12C16O+ in the ground state, have been explicitly included in a least-squares fit to determine the most precise set of molecular constants to date for the B2Σ+ and X2Σ+ states of 12C16O+. Furthermore, we report a rotational analysis of the First Negative bands of 13C16O+ for the first time. Several molecular constants characterizing 13C16O+ in the B2Σ+ and the X2Σ+ states, including spin-doubling parameters, have been determined.  相似文献   

14.
15.
Polarization properties of strange baryons produced in pp reactions, p + p↦p + Λ0 + K+ and p + p↦p + Σ0 + K+, near thresholds of the final states pΛ0K+ and pΣ0K+ are analysed relative to polarizations of colliding protons. The cross-sections for pp reactions are calculated within the effective Lagrangian approach accounting for strong pp rescattering in the initial state of colliding protons with a dominant contribution of the one-pion exchange and strong final-state interaction of daughter hadrons (Eur. Phys. J. A 9, 425 (2000)). Received: 22 October 2001 / Accepted: 14 November 2001  相似文献   

16.
葛美华  郑雨军 《中国物理 B》2011,20(8):83401-083401
We have carried out a quasi-classical trajectory calculation for the reaction of Ne + H2+ (v=0, j=1) → NeH+ + H on the ground state (12A') using the LZHH potential energy surface constructed by Lü et al. [Lü S J, Zhang P Y, Han K L and He G Z 2010 J. Chem. Phys. 132 014303]. Differential cross sections at many collision energies indicate that the reaction is dominated by forward-scattering. In addition, the NeH+ product shows rotationally hot and vibrationally cold distributions. Stereodynamical results indicate that the products are strongly polarized in the direction perpendicular to the scattering plane and that the products rotate mainly in planes parallel to the scattering plane.  相似文献   

17.
The ionic conductivity of Mg2+-stabilized potassium β-ferrites was studied in wet and dry air atmosphere and in the temperature range between room temperature and 500 °C. Several conductivity processes were determined. The impedance spectroscopic measurements were combined with thermogravimetric analysis data, and a microscopic interpretation for the effect of humidity on the conductivity of K+-β-ferrite is proposed. Between 400 and 500 °C, a change in the conductivity behavior is observed which is associated with the magnetic ordering temperature and a structural ordering in the conductivity planes of the materials. The activation energy values of the different conduction processes have been calculated.  相似文献   

18.
An extensive rotational analysis of the vibrational levels of the XOg+ state of 127I129I (5 ≤ v″ ≤ 110) and 129I2 (4 ≤ v″ ≤ 108) has been done from laser-induced-fluorescence analyzed with a Fourier transform spectrometer. The usual Dunham relationships are checked. For the range explored the lines can be recalculated with an accuracy better than 0.010 cm−1 and even 0.005 cm−1 for low J values. Checks are done from absolute hyperfine measurements.  相似文献   

19.
New type photocatalytic materials of Zn2+–Ni2+–Fe3+–CO32?LDHs were prepared by complexing agent-assisted homogeneous precipitation technique and Zn(NO3)2·6H2O, Ni(NO3)·6H2O, Fe(NO3)3·9H2O used as raw materials in the case of molar ratio of Zn2+/Ni2+/Fe3+ = 1:6:2. Zn2+–Ni2+–Fe3+–CO32?LDHs having a specific surface area of 96.5 m2/g. The structure and catalytic properties of the material were systematically studied. The experimental results show that the Zn2+–Ni2+–Fe3+–CO32?LDHs has a higher adsorption performance and lower band gap which make it an excellent catalyst for reducing the degradation of the methyl orange. Study on the process of photocatalytic reaction shows that Methyl Orange was adsorbed to the layer of Zn2+–Ni2+–Fe3+–CO32?LDHs, and then it was photodecomposed to inorganic molecules and ions by Zn2+, Ni2+, and Fe3+ on the surface of Zn2+–Ni2+–Fe3+–CO32?LDHs.  相似文献   

20.
A quantum-mechanical, three-dimensional, quasiclassical theory is developed for the effective cross section of the chemical reaction AB + CD AC + BD. The quasiclassical approximation is used on the basis of the Born formula for the differential effective cross section. The steady-phase method is used to calculate the integrals appearing in the formula for the differential effective cross section. An analytic solution of the problem is found. The formulas obtained are convenient for use in performing numerical calculations.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 2, pp. 57–62, February, 1982.  相似文献   

设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号