O2(X,v=8–22) 300 K quenching rate coefficients for O2 and N2, and O2(x) vibrational distribution from 248 nm O3 photodissociation

1994 ◽  
Vol 100 (1) ◽  
pp. 287-300 ◽  
Author(s):  
H. Park ◽  
T. G. Slanger
Keyword(s):  
Rate Coefficients ◽  
Quenching Rate ◽  
Vibrational Distribution

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.

The effect of atmospheric temperature on the calculations of the intensity of oxygen emissions in the framework of the Barth mechanism: sensitivity study

2020 ◽  
Author(s):  
Valentine Yankovsky
Keyword(s):  
Molecular Spectroscopy ◽  
Lower Thermosphere ◽  
Basic Research ◽  
Atmospheric Temperature ◽  
Sensitivity Study ◽  
Rate Coefficients ◽  
Effect Of Temperature ◽  
Kinetic Temperature ◽  
Altitude Range ◽  
Quenching Rate

<p>In the nightglow of the atmosphere in the altitude range of 90-105 km, the Barth’ mechanism is the dominant mechanism of excitation of oxygen emissions [1].</p><p>The source of oxygen emissions in this altitude range is the three-body reaction of the association of oxygen atoms. The rate coefficient of this reaction, as well as the collision quenching rate coefficients of the excited oxygen components O(<sup>1</sup>S), O<sub>2</sub>(b<sup>1</sup>Σ<sup>+</sup><sub>g</sub>), O<sub>2</sub>(a<sup>1</sup>Δ<sub>g</sub>) depend on the kinetic temperature of the gas. The method of sensitivity analysis for complex photochemical systems developed in [2] allows one to comprehensively consider the temperature dependence of the processes of excitation and quenching for each excited component. Analytical expressions will be obtained for the sensitivity coefficients of the intensities of these emissions depending on temperature and altitude. The formulas obtained are also suitable for estimation of the effect of temperature on the contribution of the Barth’ mechanism to atmospheric dayglow. This work was supported by the Russian Foundation for Basic Research (grant RFBR No. 20-05-00450 A).</p><p>1. Krasnopolsky V. A. (2011), Excitation of the oxygen nightglow on the terrestrial planets, Planetary and Space Science, 59, 754-766, doi: 10.1016/j.pss.2011.02.015.</p><p>2. Yankovsky V. A., Martyshenko K. V., Manuilova R. O., Feofilov A. G. (2016), Oxygen dayglow emissions as proxies for atomic oxygen and ozone in the mesosphere and lower thermosphere, Journal of Molecular Spectroscopy, 327, 209-231, doi: 10.1016/j.jms.2016.</p>

Vibrational relaxation and electronic quenching rate coefficients for BiF(A0+,v’) by SF6

1988 ◽  
Vol 89 (7) ◽  
pp. 4450-4451 ◽  
Author(s):  
H. Helvajian ◽  
J. S. Holloway ◽  
J. B. Koffend
Keyword(s):  
Vibrational Relaxation ◽  
Rate Coefficients ◽  
Quenching Rate
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