共查询到20条相似文献,搜索用时 15 毫秒
1.
The radiative lifetimes of the and states of CO2+ were measured by means of the delayed coincidence method. Excitation was performed by a pulsed electron beam incident on CO2. The results of these measurements are 115 ± 5 nsec for the state and 126 ± 3 nsec for the state. 相似文献
2.
M. Kamimura 《Nuclear Physics A》1981,351(3):456-480
All the multipole transition densities between the seven T = 0 states in 12C are calculated with the use of the microscopic 3α resonating-group wave functions which are obtained by dynamically solving the 3α relative motion with the total antisymmetrization taken into account exactly. The observed elastic and inelastic electron scattering form factors for the transition to the 21+, 41+, 02+, 11?and 31? states are well reproduced with no additional effective charge. The existence of a deformed intrinsic state for the 01+, 21+and 41+states is deduced by the analysis of the transition densities between them which are derived by the weak-coupling-type 3α wave functions; the intrinsic density distribution is illustrated. The monopole density distribution of the 02+, 22+ and 11?, states is found to be much longer ranged than that of the 01+, 21+ and 41+ states; the 31? state case is intermediate. On the basis of the transition densities between the 01+, 21+, 02+ and 22+ states, analysis is made of the transition between the shell-like states and the molecule-like states with a large spatial-structure change. Specific, effective nucleon-nucleon interactions are folded into the transition densities here obtained. The evident dependence of the radial shape of the folded nucleon-12C form factors on the choice of the interactions and the multi-step form factors for the excitation of the 02+, 11? and 31? states are discussed. 相似文献
3.
The vector correlations between products and reagents for the reactions Ne+H + 2 , Ne+D + 2 , and Ne+T + 2 are calculated by means of the quasi-classical trajectory method on a new potential energy surface constructed by Lü et al. [J. Chem. Phys. 2010 132, 014303]. The polarization-dependent differential cross-sections (2π/σ)(dσ 00 /dω t ), (2π/σ)(dσ 20 /dω t ), (2π/σ)(dσ 22+ /dω t ), and (2π/σ)(dσ 21 /dω t ), and the distributions of P (θ r ), P (φ r ), and P (θ r ,φ r ) are calculated. The isotopic effect, which is associated with the difference in mass factor among the three reactions, is revealed. 相似文献
4.
The vacuum uv emission of the 15N22+ ion has been recorded for the first time. Rotational analysis of two bands, analogous to those already observed in the case of the natural isotope, confirm their assignment to the D1Σu+-X1Σg+ (0, 0) and (1, 1) bands. More precise data are also obtained for the 3Σg? state which perturbs ground state vibrational levels. 相似文献
5.
Vladimir Degen 《Journal of Quantitative Spectroscopy & Radiative Transfer》1977,18(1):113-119
Previously published intensity formulas for the calculation of N2+ first negative spectra excited by electron impact on N2 given by Herzberg and Muntz are generalized and adapted to arbitrary N2X vibrational temperatures. The formulation includes all the quantities necessary for detailed computer modeling. Despite the refinements, the rotational structure and band profiles generated by the different methods agree to within a few percent at both normal (300°K) and elevated (5000°K) rotational and vibrational temperatures. Discrepancies in published A-values are noted and a recalculated array is given. 相似文献
6.
Richard A. Gottscho Robert W. Field K.A. Dick W. Benesch 《Journal of Molecular Spectroscopy》1979,74(3):435-455
Twelve bands of the N2+B2Σu+-X2Σg+ system, including vB = 0–6 and vX = 0–8, are reanalyzed. All effects of B2Σu+ ~ A2Πu perturbations are explicitly considered. Despite the use of high precision (0.01 cm?1) line measurements, no evidence for a perturber other than A2Πu is obtained. Deperturbed constants for the B2Σu+ and X2Σg+ states are derived. The deperturbation is shown to be self-consistent and complete (excluding effects of the C2Σu+ state) by examining semiempirical relationships of the perturbation matrix elements with the spin-rotation constants of the B and X states and atomic spin-orbit parameters. A number of previous analyses of transitions involving the vB = 3 and 5 levels are found to be incorrect. 相似文献
7.
J.L. Gardner James A.R. Samson 《Journal of Electron Spectroscopy and Related Phenomena》1978,13(1):7-15
The vibrational intensity distributions produced by the process of photoionization are tabulated as a function of wavelength between 745 and 304 Å for all major electronic states of O2+, N2+ and CO+. The technique of photoelectron spectroscopy was used with an electron energy analyzer of known luminosity. 相似文献
8.
A.O. Weissenberg O.K. Egorov Z.V. Minervina E.A. Pozharova V.A. Smirnitsky M.I. Dayon S.A. Krylov 《Nuclear Physics B》1976,115(1):55-60
The momenta of ~30 000 charged particles from K+ decays were measured using a magnetic spectrometer with streamer chambers. The ratio R = Γ(Kπ2+)/Γ(Kμ2+) = 0.3355 ± 0.0057 was obtained. Our values for the branching ratios are: (63.18±0.43)% for Kμ2+, (21.18±0.33)% for Kπ2+, (3.33±0.51)% for Kμ3+, (4.99±0.54)% for Ke3+. 相似文献
9.
David M Bishop 《Journal of Molecular Spectroscopy》1974,51(3):422-427
Equilibrium internuclear distances, energies, and force constants are reported for the diatomic molecules H2+, HD+, and D2+ at the adiabatic level of approximation. The differences between these values and those calculated previously at the Born-Oppenheimer level of approximation are analyzed. 相似文献
10.
M. Wernli E. Bodo F. A. Gianturco 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2007,45(2):267-272
The low-temperature (up to about 100 K) collisional
(de)excitation cross sections are computed using the full
coupled-channel (CC) quantum dynamics for both Li2 and Li2
+
molecular targets in collision with 4He. The interaction forces are
obtained from fairly accurate ab initio calculations and the
corresponding pseudo-rates are also computed. The results show
surprising similarities between sizes of inelastic flux distributions
within final states in both systems and the findings are connected
with the structural change in the molecular rotor features when the
neutral species is replaced by its ionic counterpart. 相似文献
11.
采用氮辉光放电等离子体电子与重粒子综合的Monte Carlo模型,研究了离子(N2+,N+)与氮分子碰撞产生光辐射的强度分布及其
在氮辉光放电等离子体光辐射中的作用。两种离子产生的各种碰撞激发和辐射都分布在鞘层区内,光辐射强度向阴极方向逐渐
增加,且总强度随放电电压增加而增强。相对于电子产生的碰撞激发辐射,离子(N2+,N+)引起的辐射在阴极附近引起次最大
光强,且原子离子N+的作用较分子离子N2+大。当电压较低时,离子(N2+,N+)引起的辐射可以忽略。模拟结果很好解释了两
种典型的N2辉光放电光学发射谱的实验结果,为等离子体诊断研究中的光谱数据分析提供参考。 相似文献
12.
13.
J.D. Axe L.M. Corliss J.M. Hastings W.L. Roth O. Muller 《Journal of Physics and Chemistry of Solids》1978,39(2):155-159
Incoherent inelastic neutron scattering has been used to study the motion of NH4+ ions in NH4+ β-alumina. The results establish that jump reorientation of NH4+ ions is rapid compared to translational diffusion: The data are consistent with thermally activated jumps between equivalent NH4+ orientations with a proton jump frequency of at room temperature.The data are inconsistent with either free rotation or unrestricted rotational diffusion. The residence time between translational diffusion jumps is >6 × 10?11 sec at temperatures less than 473°K. 相似文献
14.
In the framework of the Multi-Channel Quantum Defect Theory (MQDT), a theoretical study of the dissociative excitation is
presented. Numerical results for the dissociative excitation cross sections of HD
+, D
2+, and DT
+ with electrons of energy between 2 and 12 eV are reported. The contribution of the vibrational continua of the two lowest
electronic states as explicit ionization channels has been considered. Within a quasi-diabatic representation of the molecular electronic states, the Born expansion of second order is done in the K-matrix evaluation. 相似文献
15.
16.
用一束波长为360.55nm的激光,通过N2O分子的(3+1)共振多光子电离(REMPI)过程制备纯净且布居完全处于X2Π(000)态的母体离子N2O+,然后用另一束波长在275—328nm范围内的可调谐激光将制备的N2O+离子激发至预解离电子态A2Σ+.实验发现,由于解离碎片NO+所具有的一定的反冲速度,其TOF质谱峰明显比N2O+母体宽.通过分析NO+碎片TOF质谱峰形状,得到了解离产物的总平均平动能〈ET〉;通过考察〈ET〉随光解能量的变化,发现光解能量在32000cm-1附近约250cm-1的变化
关键词:
N2O+离子A2Σ+态
TOF质谱峰
预解离机理 相似文献
17.
18.
The 2Πu-X2Πg transition in Br2+ was reexamined using dispersed laser-induced fluorescence, and emission spectroscopy in a seeded molecular beam. New constants are derived, confirming the large difference between and , and reconciling the emission spectrum with photoelectron data. 相似文献
19.
Using a neutral N2 beam as target,this paper studies the dissociation of N2+ in intense femtosecond laser fields(45 fs,~1×10 16 W/cm 2) at the laser wavelength of 800 nm based on the time-of-flight mass spectra of N + fragment ions.The angular distributions of N+ and the laser power dependence of N + yielded from different dissociation pathways show that the dissociation mechanisms mainly proceed through the couplings between the metastable states(A,B and C) and the upper excited states of N2+.A coupling model of light-dressed potential energy curves of N+2 is used to interpret the kinetic energy release of N+. 相似文献
20.
Absolute ionization probabilities R for Ta+ secondary ions are determined both experimentally from comparative in-situ SNMS and SIMS measurements and theoretically on the basis of recent microscopic ionization theories as a function of the oxygen surface concentration cO. The theoretically predicted cO dependence of R for sputtered Ta particles is found to agree well with the experimental results. The comparison between experiment and theory gives quantitative estimates of factors which influence the oxygen induced ion yield enhancement. 相似文献