Kinetics of reactions involving CN emission. I. General features of reactions with active nitrogen and atomic oxygen

1965 ◽  
Vol 288 (1413) ◽  
pp. 256-274 ◽  
Keyword(s):  
Atomic Oxygen ◽  
Methylene Chloride ◽  
Transfer Reactions ◽  
Third Body ◽  
Active Nitrogen ◽  
Cyanogen Chloride ◽  
Vibrational Levels ◽  
Electronically Excited ◽  
Kinetics Of

Emission of the CN red (A -> X) and violet (B -> X) systems accompanying the reactions of active nitrogen with cyanogen, hydrogen cyanide, cyanogen chloride and methylene chloride and of oxygen atoms with cyanogen have been investigated. Bayes’s classification of the rod emission into the vibrational distributions P 1 (v' ≤ 3) and P 2 (v' ≥ 3) can be extended to the violet system, emission from levels 15 ≥ v' ≥ 5 accompanying the P 1 distribution and emission from level v' = 0 occurring with the P 2 emission. It is shown that the P 1 distribution and the excitation of the high vibrational levels of the violet system are due to collisions of CN with energetic species or CN acting as a third body for atomic recombination. The P 2 distribution is associated with the formation of electronically excited CN in exothermic transfer reactions such as N + CH = NC + H, N + CCl = NC + Cl

scholarly journals Model of daytime emissions of electronically-vibrationally excited products of O<sub>3</sub> and O<sub>2</sub> photolysis: application to ozone retrieval

2006 ◽  
Vol 24 (11) ◽  
pp. 2823-2839 ◽  
Author(s):  
V. A. Yankovsky ◽  
R. O. Manuilova
Keyword(s):  
Atomic Oxygen ◽  
Energy Exchange ◽  
Electronic States ◽  
Vibrational States ◽  
Vibrationally Excited ◽  
Proposed Model ◽  
Vibrational Levels ◽  
Electronically Excited ◽  
Basic Facts ◽  
Kinetics Of

Abstract. The traditional kinetics of electronically excited products of O3 and O2 photolysis is supplemented with the processes of the energy transfer between electronically-vibrationally excited levels O2(a1Δg, v) and O2(b1Σ+g, v), excited atomic oxygen O(1D), and the O2 molecules in the ground electronic state O2(X3Σg−, v). In contrast to the previous models of kinetics of O2(a1Δg) and O2 (b1Σ+g), our model takes into consideration the following basic facts: first, photolysis of O3 and O2 and the processes of energy exchange between the metastable products of photolysis involve generation of oxygen molecules on highly excited vibrational levels in all considered electronic states – b1Σ+g, a1Δg and X3Σg−; second, the absorption of solar radiation not only leads to populating the electronic states on vibrational levels with vibrational quantum number v equal to 0 – O2(b1Σ+g, v=0) (at 762 nm) and O2(a1Δg, v=0) (at 1.27 µm), but also leads to populating the excited electronic–vibrational states O2(b1Σ+g, v=1) and O2(b1Σ+g, v=2) (at 689 nm and 629 nm). The proposed model allows one to calculate not only the vertical profiles of the O2(a1Δg, v=0) and O2(b1Σ

Kinetics of reactions involving CN emission III. The excitation of CN in active nitrogen

1968 ◽  
Vol 305 (1480) ◽  
pp. 93-105 ◽  
Keyword(s):  
Ground State ◽  
Blue Emission ◽  
Absolute Intensity ◽  
Active Species ◽  
Active Nitrogen ◽  
System A ◽  
Vibrational Levels ◽  
Similar Quantity ◽  
Kinetics Of ◽  
Cn Radicals

The presence of carbonaceous impurities in active nitrogen causes strong blue CN emission from levels of the B 2 ∑ + state up to v ' = 15. The kinetics of this emission have been studied, and the concentrations of CN radicals measured by electronic absorption spectroscopy, in systems where the blue emission was induced by adding traces of methane before the discharge, or a similar quantity of acetylene after the discharge and examining the system a long way downstream. CN is shown to be excited by energetic species formed in nitrogen atom recombination. The absolute intensity of the emission and its kinetics suggest that lower vibrational levels of the metastable A 3 ∑ + state of N 2 are mainly responsible, but the kinetics of quenching by ammonia and water for nitrogen and argon carriers show that an additional active species is present, probably N 2 in high vibrational levels of the ground state.

The rates of elementary processes in the chain reaction between hydrogen and oxygen III. Kinetics of the combination of hydrogen atoms with nitric oxide

1967 ◽  
Vol 297 (1451) ◽  
pp. 520-533 ◽  
Keyword(s):  
Ground State ◽  
Third Body ◽  
Kcal Mole ◽  
Hydrogen Atoms ◽  
Chain Reaction ◽  
Elementary Processes ◽  
The Third ◽  
Electronically Excited ◽  
Kinetics Of ◽  
Related Process

A detailed study of the kinetics of the raction H + NO + M = HNO + M + 49.9 kcal/mole (1) shows that all the third bodies examined except H 2 O give similar relative efficiencies for the formation of ground state ( 1 A ') and electronically excited ( 1 A ") HNO. The overall rate constants found at 293°K (in cm 6 mole -2 s -1 x 10 -16 ) are: Ar, 1.11 ± 0.15; H 2 , 2.07 ± 0.18; CO 2 , 2.26 ± 0.23; N 2 O, 2⋅45 ± 0⋅44; SF 6 , 3.96 ± 0.46; H 2 O, 6.8 ± 1.2. For the reaction D + NO + Ar = DNO + Ar a rate constant of (1.28 ± 0.21) x 10 16 cm 6 mole -2 s -1 was obtained. The relative third body efficiencies in reaction (1) were less similar to the closely related Process H + O 2 + M = HO 2 + M + 47.1 kcal/mole than to the reaction O + NO + M = NO 2 + M + 73.2 kcal/mole.

scholarly journals Subauroral red arcs as a conjugate phenomenon: comparison of OV1-10 satellite data with numerical calculations

1997 ◽  
Vol 15 (8) ◽  
pp. 984-998 ◽  
Author(s):  
A. V. Pavlov
Keyword(s):  
Electron Density ◽  
Southern Hemisphere ◽  
Northern Hemisphere ◽  
Atomic Oxygen ◽  
Major Ions ◽  
Integral Intensity ◽  
Rate Coefficients ◽  
Vibrationally Excited ◽  
Vibrational Distribution ◽  
Vibrational Levels

Abstract. This study compares the OV1-10 satellite measurements of the integral airglow intensities at 630 nm in the SAR arc regions observed in the northern and southern hemisphere as a conjugate phenomenon, with the model results obtained using the time-dependent one-dimensional mathematical model of the Earth ionosphere and plasmasphere (the IZMIRAN model) during the geomagnetic storm of the period 15–17 February 1967. The major enhancements to the IZMIRAN model developed in this study are the inclusion of He+ ions (three major ions: O+, H+, and He+, and three ion temperatures), the updated photochemistry and energy balance equations for ions and electrons, the diffusion of NO+ and O2+ ions and O(1D) and the revised electron cooling rates arising from their collisions with unexcited N2, O2 molecules and N2 molecules at the first vibrational level. The updated model includes the option to use the models of the Boltzmann or non-Boltzmann distributions of vibrationally excited molecular nitrogen. Deviations from the Boltzmann distribution for the first five vibrational levels of N2 were calculated. The calculated distribution is highly non-Boltzmann at vibrational levels v > 2 and leads to a decrease in the calculated electron density and integral intensity at 630 nm in the northern and southern hemispheres in comparison with the electron density and integral intensity calculated using the Boltzmann vibrational distribution of N2. It is found that the intensity at 630 nm is very sensitive to the oxygen number densities. Good agreement between the modelled and measured intensities is obtained provided that at all altitudes of the southern hemisphere a reduction of about factor 1.35 in MSIS-86 atomic oxygen densities is included in the IZMIRAN model with the non-Boltzmann vibrational distribution of N2. The effect of using of the O(1D) diffusion results in the decrease of 4–6% in the calculated integral intensity of the northern hemisphere and 7–13% in the calculated integral intensity of the southern hemisphere. It is found that the modelled intensities of the southern hemisphere are more sensitive to the assumed values of the rate coefficients of O+(4S) ions with the vibrationally excited nitrogen molecules and quenching of O+(2D) by atomic oxygen than the modelled intensities of the northern hemisphere.

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