Rate constants of the reactions of metastable N2(A 3Σ+u) in v=0, 1, 2, and 3 with ground state O2 and O

Thomas, J. M.; Kaufman, F.

doi:10.1063/1.449243

Cited by 53 publications

(129 citation statements)

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“…The coefficients of reactions not already included in SIC 6 are rough estimates based on available measurements (Piper et al, 1981a,b;Slanger and Black, 1981;Thomas and Kaufman, 1985;Thomas et al, 1987;Pavlov and Buonsanto, 1996). These studies list only total quenching rates of N 2 , so the branching into different products must be estimated.…”

Section: A12 Reactions Of Excited Statesmentioning

confidence: 99%

Parameterisation of the chemical effect of sprites in the middle atmosphere

et al. 2008

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Abstract. Transient luminous events, such as red sprites, occur in the middle atmosphere in the electric field above thunderstorms. We here address the question whether these processes may be a significant source of odd nitrogen and affect ozone or other important trace species. A well-established coupled ion-neutral chemical model has been extended for this purpose and applied together with estimated rates of ionisation, excitation and dissociation based on spectroscopic ratios from ISUAL on FORMOSAT-2. This approach is used to estimate the NO x and ozone changes for two type cases.The NO x enhancements are at most one order of magnitude in the streamers, which means a production of at most 10 mol per event, or (given a global rate of occurrence of three events per minute) some 150-1500 kg per day. The present study therefore indicates that sprites are insignificant as a global source of NO x . Local effects on ozone are also negligible, but the local enhancement of NO x may be significant, up to 5 times the minimum background at 70 km in extraordinary cases.

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Section: A12 Reactions Of Excited Statesmentioning

confidence: 99%

Parameterisation of the chemical effect of sprites in the middle atmosphere

et al. 2008

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“…Since the B 3 − u state is mainly predissociated, we have included process (5d) in the channel of the dissociation. Experimental data of Dreyer et al (1974), The calculated total quenching rate coefficients of N 2 (A 3 + u ,v)+O 2 (X 3 − g , v=0) (solid line) are compared with experimental data by Dreyer et al (1974) (crosses), Thomas and Kaufman (1985) Thomas and Kaufman (1985), De Benedictis and Dilecce (1997) are compared with the results of our calculation for vibrational level v=0 in Fig. 7.…”

Section: Processes Of Electronic Energy Transfer and Dissociation In mentioning

confidence: 99%

“…Experimental measurements of the overall rate coefficients for the title reaction have been performed by several groups (Dreyer et al, 1974;Thomas and Kaufman, 1985; De Benedictis and Dilecce, 1997). One of the problems related to the reaction is the estimation of product branching ratios.…”

Section: Processes Of Electronic Energy Transfer and Dissociation In mentioning

confidence: 99%

The study of intermolecular energy transfers in electronic energy quenching for molecular collisions N2-N2, N2-O2, O2-O2

Kirillov

2008

Ann. Geophys.

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Abstract.Contributions of intermolecular electron energy transfers in the electronic quenching are calculated for molecular collisions N 2 (A 3The calculation has allowed one to estimate the product branching ratios. It is shown that there is a dependence of the calculated rate coefficients on the vibrational excitation of N 2 (X 1 + g ) and O 2 (X 3 − g ) molecules. In many cases, the calculated rate coefficients have a good agreement with available experimental data.

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“…The interaction between N 2 e 3 R u Y j at vibrational levels j 0±7 with O 3 give rise to many reaction channels with the total rate coecients measured by Thomas and Kaufman (1985) (Gattinger et al, 1985, Singh et al, 1996 have suggested that this value is not appropriate for the other vibrational levels, and we use a value of 0.36 recommended by Singh et al (1996).…”

Section: Modelling the Sar Arc Emission At 5577 Nmmentioning

confidence: 99%

An anomalous subauroral red arc on 4 August, 1972: comparison of ISIS-2 satellite data with numerical calculations

1999

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Abstract. This study compares the Isis II satellite measurements of the electron density and temperature, the integral airglow intensity and volume emission rate at 630 nm in the SAR arc region, observed at dusk on 4 August, 1972, in the Southern Hemisphere, during the main phase of the geomagnetic storm. The model results were obtained using the time dependent one-dimensional mathematical model of the Earth's ionosphere and plasmasphere (the IZMIRAN model). The major enhancement to the IZMIRAN model developed in this study to explain the two component 630 nm emission observed is the analytical yield spectrum approach to calculate the¯uxes of precipitating electrons and the additional production rates of Nand O 2 ions, and O 1 h in the SAR arc regions in the Northern and Southern Hemispheres. In order to bring the measured and modelled electron temperatures into agreement, the additional heating electron rate of 1X05 eV cm À3 s À1 was added in the energy balance equation of electrons at altitudes above 5000 km during the main phase of the geomagnetic storm. This additional heating electron rate determines the thermally excited 630 nm emission observed. The IZMIRAN model calculates a 630 nm integral intensity above 350 km of 4.1 kR and a total 630 nm integral intensity of 8.1 kR, values which are slightly lower compared to the observed 4.7 kR and 10.6 kR. We conclude that the 630 nm emission observed can be explained considering both the soft energy electron excited component and the thermally excited component. It is found that the inclusion of N 2 v b 0 and O 2 v b 0 in the calculations of the O 4 loss rate improves the agreement between the calculated N e and the data on 4 August, 1972. The N 2 v b 0 and O 2 v b 0 eects are enough to explain the electron density depression in the SAR arc F-region and above F2 peak altitude. Our calculations show that the increase in the O N 2 rate factor due to the vibrationally excited nitrogen produces the 5±19% reductions in the calculated quiet daytime peak density and the 16± 24% decrease in NmF2 in the SAR arc region. The increase in the O N 2 loss rate due to vibrationally excited O 2 produces the 7±26% decrease in the calculated quiet daytime peak density and the 12±26% decrease in NmF2 in the SAR arc region. We evaluated the role of the electron cooling rates by low-lying electronic excitation of O 2 1 D g and O 2 1 R g , and rotational excitation of O 2 , and found that the eect of these cooling rates on e can be considered negligible during the quiet and geomagnetic storm period 3±4 August, 1972. The energy exchange between electron and ion gases, the cooling rate in collisions of O 3 with thermal electrons with excitation of O 1 h, and the electron cooling rates by vibrational excitation of O 2 and N 2 are the largest cooling rates above 200 km in the SAR arc region on 4 August, 1972. The enhanced IZMIRAN model calculates also number densities of N 2 f 3 P g Y N 2 g 3 P u , and N 2 e 3 R u at several vibrational levels, O 1 , and the volume emission rate and integr...

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Rate constants of the reactions of metastable N2(A 3Σ+u) in v=0, 1, 2, and 3 with ground state O2 and O

Cited by 53 publications

References 20 publications

Parameterisation of the chemical effect of sprites in the middle atmosphere

Parameterisation of the chemical effect of sprites in the middle atmosphere

The study of intermolecular energy transfers in electronic energy quenching for molecular collisions N<sub>2</sub>-N<sub>2</sub>, N<sub>2</sub>-O<sub>2</sub>, O<sub>2</sub>-O<sub>2</sub>

An anomalous subauroral red arc on 4 August, 1972: comparison of ISIS-2 satellite data with numerical calculations

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Rate constants of the reactions of metastable N2(A 3Σ+u) in v=0, 1, 2, and 3 with ground state O2 and O

Cited by 53 publications

References 20 publications

Parameterisation of the chemical effect of sprites in the middle atmosphere

Parameterisation of the chemical effect of sprites in the middle atmosphere

The study of intermolecular energy transfers in electronic energy quenching for molecular collisions N&lt;sub&gt;2&lt;/sub&gt;-N&lt;sub&gt;2&lt;/sub&gt;, N&lt;sub&gt;2&lt;/sub&gt;-O&lt;sub&gt;2&lt;/sub&gt;, O&lt;sub&gt;2&lt;/sub&gt;-O&lt;sub&gt;2&lt;/sub&gt;

An anomalous subauroral red arc on 4 August, 1972: comparison of ISIS-2 satellite data with numerical calculations

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The study of intermolecular energy transfers in electronic energy quenching for molecular collisions N<sub>2</sub>-N<sub>2</sub>, N<sub>2</sub>-O<sub>2</sub>, O<sub>2</sub>-O<sub>2</sub>