Radiative lifetimes and quenching rate coefficients for directly excited rotational levels of OH (A 2Σ+,v′=0)

1982 ◽  
Vol 76 (4) ◽  
pp. 1824-1831 ◽  
Author(s):  
I. Stuart McDermid ◽  
James B. Laudenslager
Keyword(s):  
Rate Coefficients ◽  
Quenching Rate ◽  
Radiative Lifetimes

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>

The collisional deactivation of metastable atoms and molecules in the upper atmosphere

1969 ◽  
Vol 47 (10) ◽  
pp. 1863-1870 ◽  
Author(s):  
E. C. Zipf
Keyword(s):  
Diffusion Coefficients ◽  
Reaction Rate ◽  
Vacuum Ultraviolet ◽  
Upper Atmosphere ◽  
Rate Coefficients ◽  
Atmospheric Measurements ◽  
Radiative Lifetimes ◽  
Atoms And Molecules ◽  
New Information ◽  
Excited Species

It is now possible to produce comparatively large concentrations of highly reactive metastable species in laboratory sources and to study metastable atoms and molecules with very long radiative lifetimes by photoionization mass spectroscopy, by vacuum ultraviolet absorption techniques, or by direct observation of the feeble radiation emitted by these excited species. These methods are being used widely to study the collisional deactivation of aeronomically important metastable species by quenching or by reaction. New information on radiative lifetimes, diffusion coefficients, and reaction rate coefficients is now available. These results are tabulated and reviewed in the light of atmospheric measurements and current theories of the terrestrial airglow and aurora.

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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