共查询到20条相似文献,搜索用时 15 毫秒
1.
A. I. Volkov G. G. Volkova V. K. Yermolaev L. A. Sazonov 《Reaction Kinetics and Catalysis Letters》1982,20(3-4):283-288
Radiolysis of adsorbed N2O is shown to occur due to both the dissociative capture of electrons and direct energy transfer from the excited states of alumina to N2O. One excited state ensures the decomposition of three N2O molecules.
, N2O , N2O, N2O.相似文献
2.
Infrared fluorescence has been observed from the ν1, ν6, 2ν9, ν8 and ν4 levels of CH2F2 following excitation by a 9.6 μ Q-switch CO2 laser. All the observed states exhibit a single exponential decay rate of approximately 44 msec?1 torr?1. The rare gas dependence of this rate has also been measured and found to be up to 20 times slower than the rate for the pure gas. Measurements of the risetimes of the observed fluorescence signals yielded an upper limit of 5 μsec at 1 torr for the ν1, ν6 and ν8 levels. The 2ν9 and ν4 risetimes were effectively instantaneous under the experimental conditions that prevailed. The relative magnitudes of the measured rate are discussed in terms of existing V-T/R theories and collisional energy transfer processes. 相似文献
3.
Vibrational energy transfer from SF6 to N2O was studied as a function of SF6 vibrational energy. The intensity, rise time and decay time of N2O fluorescence increased monotonically with the level of donor excitation. The observations are consistent with a mechanism that is not mode specific, with donor VT relaxation faster than intermolecular VV transfer. 相似文献
4.
Rotational energy excitation produces disparate effects on the ionization efficiency curves of H2 and N2. While no observable shift in the N2 ionization curve occurs on heating, the H2 ionization curve is displaced significantly, indicating that, in the case of H2, rotational energy is being efficiently converted into electronic energy. 相似文献
5.
Hyung Kyu Shin 《Chemical physics letters》1976,37(1):143-146
A semiclassical approach is developed to study vibrational energy transfer in H2 + He by use of the a priori interaction potential including all nonzero impact parameter collisions. The calculated values of the rate coefficient are found to be in excellent agreement with experimental data which are available in the temperature ranges 60–450 K and 1350-3000 K. The temperature dependence is shown to seriously deviate from the Landau-Teller prediction below 1000 K. The calculation was carried out over the temperature range of 30 to 10000 K. 相似文献
6.
Low-energy electron impact leads to non-dipole excitation of core electrons to triplet states. The multiples splitting in CO is in agreement with theory and shows that the 2π orbital is localized predominantly on the carbon. The splitting affects both energy-loss and Auger spectra of CO and N2. 相似文献
7.
Emission spectra resulting from reaction of “clean” N2(A3 Σu+) with copper atoms were studied using a flowing afterglow apparatus. The population distribution of the Cu states was calculated from the spectrum; it indicates that Cu atoms are excited by nearly resonant energy transfer processes. N2(A,v') + Cu(2S) → N2(X, v) + Cu* , and that the transfer is most efficient for N2(A,v') → N2(X,v) transitions with large Franck-Condon factors. The preferential energy transfer results in population inversion between some of the Cu states. 相似文献
8.
Intramolecular vibrational excitation accompanied by multiphonon transitions in solid multilayer N2 flims is studied by electron impact. The intensity of tne first three vibrational modes of ground-state N2 exhibits broad resonances as a function of incident election energy in the range 1–25 eV. These features appear closely related to negative-ion shape resonances. 相似文献
9.
10.
The fluorescence transitions corresponding to the second positive system of N2 (C3Πu → B3Πg) for Δv = 0, 1 and the first negative system of N+2(B2Σ+u → X2Σ+g) for Δv = 0, 1, 2 have been observed following laser-induced mul excitation of N2. 相似文献
11.
Ab initio investigation on the role of multielectron transitions in the discrete and near continuum parts of the K-shell electron energy loss spectrum of N2 are reported. An explanation for observed fine structure in the continuum is suggested. 相似文献
12.
Gert Due Billing 《Chemical physics》1982,67(1):35-47
Rate constants for inter- and intra-molecular energy transfer in the N2 + CO2 system are obtained in the temperature range 200–2000 K with three different sets of potential short-range parameters. Comparison with available experimental data is carried out. The analytical solution to the “inversion problem” for the M-quantum case is also presented. 相似文献
13.
Flash photolysis of NO coupled with time resolved detection of O via resonance fluorescence has been used to obtain rate constants for the reaction O + NO + N2 → NO2 + N2 at temperatures from 217 to 500 K. The measured rate constants obey the Arrhenius equation k = (15.5 ± 2.0) × 10?33 exp(1160 ± 70)/1.987 T] cm6 molecule?2 s?1. An equally acceptable equation describing the temperature dependence of k is k = 3.80 × 10?27/T1.82 cm6 molecule?2 s?1. These results are discussed and compared with previous work. 相似文献
14.
We have observed vibrationally excited sulfur hexafluoride molecules in direct inelastic scattering from hot graphite surfaces. The vibrational temperature for the scattered flux has been determined by probing the effect of internal temperature on electron-induced fragmentation observed in mass spectra. The vibrational excitation depends on incident translational energy, Etr, and a maximum temperature increase of 50 K is reached in direct scattering at Etr = 2.5 eV. No effect of surface temperature has been observed at 950–1400 K. Inelastic angular distributions are reproduced by a collision complex model, and the experimental results are related to existing models for vibrational excitation. 相似文献
15.
Haiwen Wei Zhen Li Honglei Wang Yang Yang Pengfei Cheng Peigeng Han Ruiling Zhang Feng Liu Panwang Zhou Keli Han 《Journal of Energy Chemistry》2023,(7):18-24
Lead(Pb)-free halide perovskites have recently attracted increasing attention as potential catalysts for CO2photoreduction to CO due to their potential to capture solar energy and drive catalytic reaction.However, issues of the poor charge transfer still remain one of the main obstacles limiting their performance due to the overwhelming radiative and nonradiative charge-carrier recombination losses. Herein,Pb-free Sb-alloyed all-inorganic quadruple perovskite Cs4Mn(Bi1... 相似文献
16.
An ab initio calculation of electron transfer reactivity of Mn2+OH2/Mn3+OH2 redox system, in gas and in solution, has been made in this paper. The detailed geometry optimization and the scanning of the potential energy surfaces have been carried out at UMP2 (full)/6-311+G* level. The relevant energy quantities (such as the activation energy and the binding energy) are calculated at different levels of theory (HF, MP2, MP3, MP4 and QCISD and corresponding spin-projection PUHF, PMP2 and PMP3) with the same basis set (6-311+G*). Both all-electrons and valence electrons have been correlated in energy calculations. The electronic transmission coefficient is calculated using the ab initio potential energy surface slopes and the coupling matrix element determined from the two-state model and the Slater-type d-electron wave functions. The pair distribution function is obtained using both a classical sphere approximation scheme and a novel scheme. The relevant kinetic parameters are obtained at different ab initio levels in terms of the new model. The contact-distance dependence of these parameters and the applicability of the presented models are also discussed. 相似文献
17.
A liquid-nitrogen-cooled, active-N2-pumped CO laser has produced cw oscillation from ν = 2 → ν = 1 (4.8 μm) to ν = 35 → ν = 34 (8.0 μm). An analysis of the output spectrum gives the VT relaxation rate of CO (ν ≈30) by He at 150°K as 2 × 103 sec−1 torr−1. 相似文献
18.
Collisional energy transfer from CO2 to SO2 was studied subsequent to pumping of CO2 (ν3) by a Q-switched laser. The measurements were made in the temperature range 300–800 K and in the pressure range 1–30 Torr. The fluorescence from the ν3 level of CO2 was monitored with the help of a Ge:Au detector at 77 K with an estimated response time of ≈2 μs. The probability of the energy transfer was found to be increasing with increasing temperature. The probable kinetic models for the V---V relaxation pathways were discussed and the experimentally measured energy transfer rate is related to the cross-over transfer processes. Theoretical calculations using both a simple SSH-breathing sphere model and the Sharma-Brau theory were carried out to evaluate the probabilities of the involved cross-over energy transfer processes and the results were compared with the experimental rates. 相似文献
19.
A trajectory program was used to simulate the collisions of CH3NC with He, Xe, H2 and N2. Calculated energy transfer is in accord with experiment. The pattern of CH3NC vibrational mode energization is found to be noticeably non-random. The approximate sampling methods used in thermal unimolecular trajectory studies produce a more uniform state distribution. 相似文献
20.
E.A. Andreev 《Chemical physics letters》1973,23(4):516-517
The quenching of alkali metals (A) and vibrational relaxation of N2 by N2 - A collisions are considered and probabilities of different elementary processes are calculated. 相似文献