The quenching of N(²<i>D</i>) by O(³<i>P</i>)

Davenport, John E.; Slanger, T. G.; Black, G.

doi:10.1029/ja081i001p00012

Cited by 67 publications

(19 citation statements)

References 15 publications

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“…Reference Young et al, 1968Black et al, 1969Lin & Kaufman, 1971 Table 17. Reference Black et a1., 1975Davenport et al, 1976Davenport et al, 1976 Nep) An overall assessment of the available data for NeD) mdicates that the single value of Black et al (1969) for NHg may be about a factor of two high, suggesting k == 5 X 10-)] at 300 K. The interaction is probably the fast exothermic chemical reaction N(2D) + NH g = NH + NH2 ilH~8 K = -150.2 kJ mol-I (-35.90 kcal mol-I) which is not observed with low temperature ground state N atoms owing to its endothermicity. N(4S) so.…”

Section: Rate Constants For Reactions Of Excited Speciesmentioning

confidence: 98%

Critically evaluated rate constants for gaseous reactions of several electronically excited species

Schofield¹

1979

Journal of Physical and Chemical Reference Data

186

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An extensive evaluation is presented of the available gas phase chemical kinetic rate constants for the interac· tions of the low lying electronic states of several atoms and molecules with numerous collision partners. These include the following excited states: C(2 1 D 2 ,2 1 S o ), N(2 2 D31l,5/2, 2 2 P1I1, 3/2), P(32D3/2,51l,32Pl/2,3/2), S(3 1 D 2 ,3 I S 0 ), Se(4 S P o ' 4 1 D 2 ,4 1 S 0 ), Te(53PI,o,51D2,5ISo)' COCa an, a'3I;+,d aA,e 3I;-,A III), CS(a all, A III), OH(A 2I;+), OD(A 2£+), 02(C lE~,C 3A u .A 3I;~,B 3r;~), and S2(a IAg,b lE;,A ar;~,B ar;~). Wherever possible, recommended values are suggested. Much of the data refers only to room temperature. To facilitate the evaluation, colJision·free radiative lifetimes often have been required. These also have been evaluated and are presented. The mechanisms of the interactions and the various potential kinetic channels are discussed. These include such processes as chemical reactions, electronic quenching to the ground electronic state, electronic cross relaxation to an adjacent excited state, and for molecules, vibrational and rotational relaxation processes within the excited state. A complete coverage of the literature published prior to 1978 has been attempted.

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Section: Rate Constants For Reactions Of Excited Speciesmentioning

confidence: 98%

Critically evaluated rate constants for gaseous reactions of several electronically excited species

Schofield¹

1979

Journal of Physical and Chemical Reference Data

186

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“…The rate coefficient for R3 used in our present calculation is k3-8.5X 1012exp (-500/T) cm3s-1 which is based on the laboratory experiment by DAVENPORT et al (1976), k3 reaches 5X10-12cm3s-1 for T-1,000K which commonly occurs in the thermosphere. However, RUSCH et al (1975) becomes larger by a factor of more than 1.5 for the 5,200A intensities observed by WALLACE and MCELROY (1966).…”

Section: Effect Of the Quenching Of N(2d) Bymentioning

confidence: 99%

“…TORR et al (1976) have obtained k3 1.5-2.5X10-12cm-3 s-1 from the NI (5,200A) nightglow profile measurement. DAVENPORT et al (1976) have measured this rate coefficient in the laboratory and obtained a value of k3=1.8x10-12cm3s-1 at 315K with a positive temperature dependence. Although these values of k3 differ from one another, the quenching should not be neglected in modeling the odd nitrogen distribution.…”

Section: Introductionmentioning

confidence: 99%

A temperature-dependent model of the thermospheric odd nitrogen.

Kondo

Ogawa

1977

J. geomagn. geoelec

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The diurnal variations of odd nitrogen species (N, NO) in the thermosphere are modelled by solving the time-dependent, one-dimensional continuity equations with the diffusion transport which have been developed by OGAWA and SHIMAZAKI (1975). By comparing the calculated results with N and NO distributions which were determined in an airglow (NI 5, and mass spectrometric observations the following conclusions have emerged.(1) The quantum yield of N(2D) in the reactions energetically capable of producing the excited species should be larger than 0.5, and probably as large as 0.9. (2) The quenching of N(2D) by atomic oxygen is important at altitudes above 120km. In order to be consistent with the observation of NI 5,200A airglow, the quenching coefficient must be as large as 1X10-12cm3s-1. (3) The variability of NO density profiles obtained by various experimenters is largely interpreted to be due to the large diurnal variations of odd nitrogen expected from a large diurnal change in the thermospheric temperature which is also under the control of solar activities.

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“…Process (27) has not been considered in Ogawa-Shimazaki's 1975 model, but it is found to be fast in laboratory experiments (DAVENPORT et al, 1976).…”

Section: Brief Description Of Odd Nitrogen Chemistrymentioning

confidence: 99%

Measurement of nitric oxide abundance in equatorial upper atmosphere.

Tohmatsu

Iwagami

1976

J. geomagn. geoelec

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The altitude distribution of nitric oxide gamma band emissions in the day airglow was measured by the ultraviolet radiometer aboard a sounding rocket flown early in the morning from Thumba, India. The nitric oxide (NO) concentration could be determined for the first time in the equatorial upper atmosphere in the altitude range between 85 and 140km. The altitude distribution of NO below 105km is similar to those obtained by Meira in 1969 and by the present authors in 1973. The absolute concentration is, however, by a factor of 2 to 4 smaller than that measured in previous experiments. A maximum concentration of (2.7f0.6)x107cm 3 appears at the 105f2 km altitude. The concentration drops off quickly as the altitude increases from 105 to 120km, then decreases rather slowly at higher altitudes. The small abundance of NO can be interpreted by a combined effect of the diurnal variation of odd nitrogen species and reduced solar ultraviolet fluxes producing excited atomic nitrogen N(2D). It favors again a smaller abundance of N(2D) caused by the deactivation due to atomic oxygen.

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The quenching of N(²D) by O(³P)

Cited by 67 publications

References 15 publications

Critically evaluated rate constants for gaseous reactions of several electronically excited species

Critically evaluated rate constants for gaseous reactions of several electronically excited species

A temperature-dependent model of the thermospheric odd nitrogen.

Measurement of nitric oxide abundance in equatorial upper atmosphere.

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