Vibrational kinetics of molecular nitrogen and its role in the composition of the polar thermosphere

Aladjev, G. A.; Kirillov, A. S.

doi:10.1016/0273-1177(95)00106-o

Cited by 14 publications

(9 citation statements)

References 8 publications

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“…This reduces, relative to the present results, the contribution to higher vibrational levels, and particularly to the excited states. As expected, their results are quantitatively different to ours (see Figure 8), but nevertheless, Aladjev and Kirillov [1995] reached the same conclusion as Richards et al [1986] and this study in that cascade from the A state is the most probable mechanism for populating high vibrational levels of the X state.…”

Section: Production Of Vibrationally Excited N2 In the Thermospherecontrasting

confidence: 70%

“…Figure 8 compares the relative (to ν ″ = 1) contributions of direct and cascade population rates to the vibrational levels of the X state predicted by our model at altitudes of 130 and 200 km, as a function of the vibrational quantum number, with predictions from Aladjev and Kirillov [1995] for altitudes of 120, 150, and 200 km. In an effort to determine the conditions under which enhanced concentrations of NO might be formed in aurora, Aladjev and Kirillov [1995] examined the relative importance of collisions of O( 1 D) with N 2 and O 2 and kinetic‐to‐vibration [TV], elastic vibration‐to‐vibration [VV], and vibrational excitation/deexcitation [VV′] energy transfer processes among the atmospheric species, in addition to electron impact processes. However, for their electron impact spectrum they used a Maxwellian distribution, rather than a detailed auroral spectrum which has substantial flux at higher energies.…”

Section: Production Of Vibrationally Excited N2 In the Thermospherementioning

confidence: 99%

“…The present results are shown by direct excitation (curve with squares) and cascade excitation contribution (curve with circles). Also shown in Figure 8 (left) are the direct and cascade predictions for 120 and 150 km from Aladjev and Kirillov [1995] and in Figure 8 (right) for 200 km.…”

Section: Production Of Vibrationally Excited N2 In the Thermospherementioning

confidence: 99%

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Role of electronic excited N₂ in vibrational excitation of the N₂ ground state at high latitudes

Campbell¹,

Cartwright²,

Brunger³

et al. 2006

J. Geophys. Res.

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[1] Vibrationally excited N 2 is important in determining the ionospheric electron density and has also been proposed to play a role in the production of NO in disturbed atmospheres. We report here predictions of the absolute vibrational distributions in the ground electronic state of N 2 produced by electron impact excitation, at noon and midnight under quiet geomagnetic conditions and disturbed conditions corresponding to the aurora IBCII + and IBCIII + at 60°N latitude and 0°longitude, at altitudes between 130 and 350 km. These predictions were obtained from a model which includes thermal excitation and direct electron impact excitation of the vibrational levels of the N 2 ground state and its excited electronic states; radiative cascade from all excited electronic states to all vibrational levels of the ground electronic state; quenching by O, O 2 , and N 2 ; molecular and ambipolar diffusion; and the dominant chemical reactions. Results from this study show that for both aurora and daytime electron environments: (1) cascade from the higher electronic states of N 2 determines the population of the higher vibrational levels in the N 2 ground state and (2) the effective ground state vibrational temperature for levels greater than 4 in N 2 is predicted to be in the range 4000-13000 K for altitudes greater than 200 km. Correspondingly, the associated enhancement factor for the O + reaction with vibrationally excited N 2 to produce NO + is predicted to increase with increasing altitude (up to a maximum at a height which increases with auroral strength) for both aurora and daytime environments and to increase with increasing auroral strength. The contribution of the cascade from the excited electronic states was evaluated and found to be relatively minor compared to the direct excitation process.

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Section: Production Of Vibrationally Excited N2 In the Thermospherecontrasting

confidence: 70%

Section: Production Of Vibrationally Excited N2 In the Thermospherementioning

confidence: 99%

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Role of electronic excited N₂ in vibrational excitation of the N₂ ground state at high latitudes

Campbell¹,

Cartwright²,

Brunger³

et al. 2006

J. Geophys. Res.

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“…NO + N can also be an important source of NO and Vlasov et al [1980] proposed it as the main source of NO in strong aurora. Its rate is quoted as 10 À11 cm 3 s À1 by Aladjev and Kirillov [1995], who ascribe it to Rusanov and Fridman in a publication in Russian. This value is larger than used in some recent work [Pintassilgo et al, 2005].…”

Section: Introductionmentioning

confidence: 96%

Role of excited N₂ in the production of nitric oxide

2007

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[1] Excited N 2 plays a role in a number of atmospheric processes, including auroral and dayglow emissions, chemical reactions, recombination of free electrons, and the production of nitric oxide. Electron impact excitation of N 2 is followed by radiative decay through a series of excited states, contributing to auroral and dayglow emissions. These processes are intertwined with various chemical reactions and collisional quenching involving the excited and ground state vibrational levels. Statistical equilibrium and time step atmospheric models are used to predict N 2 excited state densities and emissions (as a test against previous models and measurements) and to investigate the role of excited nitrogen in the production of nitric oxide. These calculations predict that inclusion of the reaction N 2 [A 3 S u + ] + O, to generate NO, produces an increase by a factor of up to three in the calculated NO density at some altitudes.

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“…Cartwright (1978), Benesch (1981Benesch ( , 1983, Morrill and Benesch (1996), and Kirillov (2008, 2010 have shown that vibrational populations of triplet manifolds of molecular nitrogen at the altitudes of the ionosphere by auroral electron precipitation (with energy <50 keV) are strongly affected by collision processes. Very important role of electronically excited molecular nitrogen on vibrational populations of the N 2 ground state in auroral atmosphere was shown by Aladjev and Kirillov (1995), Campbell et al (2006), and Kirillov (2012). Another important role of electronically excited N 2 in the production of nitric oxide in the atmosphere was studied by Swider (1976), O'Neil et al (1979, Campbell et al (2007), and Campbell and Brunger (2016).…”

Section: Introductionmentioning

confidence: 99%

The Kinetics of N₂ Triplet Electronic States in the Upper and Middle Atmosphere During Relativistic Electron Precipitation

Kirillov

Belakhovsky

2019

Geophysical Research Letters

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The electronic kinetics of N2 triplet states A3Σu+, B3Πg, W3Δu, B'3Σu−, and C3Πu in the upper and middle atmosphere of the Earth during relativistic electron precipitation is considered. Intramolecular and intermolecular electron energy transfers in inelastic collisions of electronically excited molecular nitrogen with N2 and O2 molecules are taken into account in the calculations. The calculations indicate an influence of atmospheric density increase on the calculated vibrational populations of the B3Πg state. For the first time it is shown that there is a dependence of the calculated column intensity ratios of first and second positive bands on the energy of relativistic electrons. The calculated column intensity ratios I(749 nm)/I(337 nm) and I(669 nm)/I(337 nm) decrease with increasing relativistic electron energy.

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Vibrational kinetics of molecular nitrogen and its role in the composition of the polar thermosphere

Cited by 14 publications

References 8 publications

Role of electronic excited N₂ in vibrational excitation of the N₂ ground state at high latitudes

Role of electronic excited N₂ in vibrational excitation of the N₂ ground state at high latitudes

Role of excited N₂ in the production of nitric oxide

The Kinetics of N₂ Triplet Electronic States in the Upper and Middle Atmosphere During Relativistic Electron Precipitation

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Vibrational kinetics of molecular nitrogen and its role in the composition of the polar thermosphere

Cited by 14 publications

References 8 publications

Role of electronic excited N2 in vibrational excitation of the N2 ground state at high latitudes

Role of electronic excited N2 in vibrational excitation of the N2 ground state at high latitudes

Role of excited N2 in the production of nitric oxide

The Kinetics of N2 Triplet Electronic States in the Upper and Middle Atmosphere During Relativistic Electron Precipitation

Contact Info

Product

Resources

About

Role of electronic excited N₂ in vibrational excitation of the N₂ ground state at high latitudes

Role of electronic excited N₂ in vibrational excitation of the N₂ ground state at high latitudes

Role of excited N₂ in the production of nitric oxide

The Kinetics of N₂ Triplet Electronic States in the Upper and Middle Atmosphere During Relativistic Electron Precipitation