Low-energy collisions between some atmospheric ions and neutral particles

Stebbings, R. F.; Turner, B. R.; Rutherford, J. A.

doi:10.1029/jz071i003p00771

Cited by 133 publications

(36 citation statements)

References 11 publications

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“…Using groundstate O + ions reacting with N, to produce NO+, an energy dependence of the rate coefficient which increased with energy was found, the increase being compatible with the increase in cross section for this reaction as obtained from crossed beam (25) and beam-instatic-gas (26) experiments. The apparent increase in rate coefficient for 0+ + 0, -> 0 + 02+ at energies greater than 0.5 eV has already been noted earlier in this paper.…”

Section: Thermal To Mediutn Energiessupporting

confidence: 51%

Positive ion reactions

Fite

1969

Can. J. Chem.

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Progress over the past five years in the measurement of rate coefficients and cross sections for interactions between positive ions and neutral niolecules of particular interest to aeronomy is reviewed. Emphasis is placed on the methods of experimentation developed for studies in the range of thernial energies and slightly above. Along with discussion of the range of applicability of each of the techniques, illustrated by examples of nieasurenients on processes of aeronomic interest, some evaluation of limitations of applicability and reliability of the nieasurernents is made. A table surnrnarizing results obtained to date on processes pertaining to the atmospheres of the earth and neighboring planets is presented.Canadian Journal of Chemistry, 47, 1797 (1969) Introductionreactants being in excited states are assessed, and Five years ago at the symposium preceding the present one, two reports summarized experimental work on collisions between ions and neutral atomic systems of interest to aeronomy. Paulson (1) reviewed the situation with regard to experiments at thermal and low energies and the present author summarized experiments where the relative energy was sufficiently high that ion beam methods were employed (2). At that time the higher energy techniques were well established and a number of results had been obtained; however, to apply the results to problems of low energies, extrapolation by rather unreliable means had to be employed. In only a few cases were thermal and low energy data available since the techniques of experimenting at these low energies were in a very early stage of development.The five years intervening between these symposia has seen the situation reverse itself. The development of low energy experimental methods has been rapid and the amount of low energy data on the principal atmospheric species is now quite large. To an ever-increasing extent, the role of the higher energy experiments is to examine details of reactions in order to better interpret the lower energy results as they apply to the atmosphere and to discover processes deserving of attention in thermal energy experiments.Accordingly, it is appropriate here to review the principal laboratory methods now in use to obtain thermal energy data on total cross sections and reaction rate coefficients for ion-neutral reactions, to examine briefly the modifications of these methods and alternative methods by which the effects of increased kinetic energy and

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Section: Thermal To Mediutn Energiessupporting

confidence: 51%

Positive ion reactions

Fite

1969

Can. J. Chem.

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“…Early measurements by STEBBINGS et al (1966), and RUTHERFORD and VRODM 1971,1974), at high ion kinetic energies (0.5eV) set the rate coefficient for this with the lower rate. Subsequently, in the light of the reawakened interest caused by the aeronomical nroress.…”

Section: Areas Of Significant Progressmentioning

confidence: 96%

Neutral and ion chemistry and solar fluxes.

Torr

1983

J. geomagn. geoelec

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“…where q0+( 2 D} is the production rate of 0+(2D) due to photoionization. The equilibrium concentration thus computed by ignoring and by including reaction (14) for three different values of K 4 are shown in Fig. 3.…”

Section: Equilibrium Concentration Of Metastable O• Ionsmentioning

confidence: 99%

“…... (18) ... (13) ... (14) ... (19) The rate coefficient oc 3 for the deactivation of 0+( 2 D} to the ground state 0+( 4 S) by superelastic collision is taken to be 3 x.to-s cm.s sec.-1 Seaton and Osterbroke 9 •…”

Section: Equilibrium Concentration Of Metastable O• Ionsmentioning

confidence: 99%

Metastable Atomic Oxygen Ions in Ionospheric Plasma

Singh

Tolpadi

1970

IETE Journal of Research

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In this paper, production of atomic oxyaen Ions In the F-realon of the Ionosphere due to the photoionlzation of atomic oxyaen atoms by Solar XUV Is considered. Knowina the transition probability for the around and different excited states, the rates of production of atomic oxyaen Ions in the around and various excited states are computed. By considerlna various production and loss mechanisms, the equilibrium concentration of atomic oxyaen Ions in the around and excited states are _!=Omputed In the helaht ranae 120-320 km. In particular, the various de-excitation mechanisms and their contributions for the concentration of metastable Ions o•( 1 P) and o•(•D) are determined under different de-excitation mechanisms and for various rate coefficients for the important de-excitation processes. It was found that most of the atomic oxyaen ions are In the around state. The equilibrium concentration of o•(•P) peaks at 160-200 km, the actulll helaht depending on the rate coefficient for the reaction o•(•P)+N 1 -+N•+O. Similarly, the equilibrium concentration of o•(•D) was found to be mainly controlled by the rate coefficient for the reaction o•(•D)+N 1 -+ N: +0. Line intensities for some of the transitions involvinll the metastable atomic oxyaen ions are computed and compared with the experimental results.

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Low-energy collisions between some atmospheric ions and neutral particles

Cited by 133 publications

References 11 publications

Positive ion reactions

Positive ion reactions

Neutral and ion chemistry and solar fluxes.

Metastable Atomic Oxygen Ions in Ionospheric Plasma

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