Temperature Dependence of the Electron—<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mspace /><mml:mrow><mml:msubsup><mml:mrow><mml:mi mathvariant="normal">O</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msubsup></mml:mrow></mml:math>-Ion Recombination Coefficient

Kasner, W. H.; Biondi, Manfred A.

doi:10.1103/physrev.174.139

Cited by 73 publications

(8 citation statements)

References 21 publications

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“…The total rate coefficient curves also show variations from the general behavior k(O 2 ϩ )ϳE c Ϫ0. 5 . These variations are due to resonances, which differ from the general behavior arising from direct capture-dissociation mechanisms.…”

Section: Discussionmentioning

confidence: 99%

“…The reported laboratory values [3][4][5][6][7][8][9][10][11][12][13] range from 1.7•10 Ϫ7 to 2.4•10 Ϫ7 cm 3 s Ϫ1 at 300 K. The commonly used value for ground-state oxygen ions at 300 K is 1.95•10 Ϫ7 cm 3 s Ϫ1 . In general, the temperature dependence of the thermal rate coefficient is reported to follow ␣(O 2 ϩ )ϳT Ϫ0.7 with T pertaining mainly to the electron temperature.…”

Section: Introductionmentioning

confidence: 99%

“…In merged-beam experiments it is the rate coefficient, k, in terms of the electron collision energy which is commonly reported and its dependence is found [13][14][15][16] to be k(O 2 ϩ )ϳE c Ϫ0. 5 . The agreement on the thermal rate coefficient is somewhat surprising in view of the fact that many of these experiments had unknown and certainly often different vibrational populations of the parent ions.…”

Section: Introductionmentioning

confidence: 99%

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Vibrationally resolved rate coefficients and branching fractions in the dissociative recombination of O2+

Petrignani

Zande

Cosby

et al. 2004

The Journal of Chemical Physics

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We have studied the dissociative recombination of the first three vibrational levels of O 2 ϩ in its electronic ground X 2 ⌸ g state. Absolute rate coefficients, cross sections, quantum yields and branching fractions have been determined in a merged-beam experiment in the heavy-ion storage ring, CRYRING, employing fragment imaging for the reaction dynamics. We present the absolute total rate coefficients as function of collision energies up to 0.4 eV for five different vibrational populations of the ion beam, as well as the partial ͑vibrationally resolved͒ rate coefficients and the branching fractions near 0 eV collision energy for the vibrational levels vϭ0, 1, and 2. The vibrational populations used were produced in a modified electron impact ion source, which has been calibrated using Cs-O 2 ϩ dissociative charge transfer reactions. The measurements indicate that at low collision energies, the total rate coefficient is weakly dependent on the vibrational excitation. The calculated thermal rate coefficient at 300 K decreases upon vibrational excitation. The partial rate coefficients as well as the partial branching fractions are found to be strongly dependent on the vibrational level. The partial rate coefficient is the fastest for vϭ0 and goes down by a factor of two or more for vϭ1 and 2. The O( 1 S) quantum yield, linked to the green airglow, increases strongly upon increasing vibrational level. The effects of the dissociative recombination reactions and super elastic collisions on the vibrational populations are discussed.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Vibrationally resolved rate coefficients and branching fractions in the dissociative recombination of O2+

Petrignani

Zande

Cosby

et al. 2004

The Journal of Chemical Physics

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“…4). By way of contrast, Kasner (29) finds that a(Ne2+) varies as T-0.42 (Tc = Ti = Tn = T) over the range 300-500 OK, while Frornmhold et al (!0) find an essentially identical power law variation with electron temperature (a -T,-'. "~) over the range 300 "K ,< T, ,< 11 000 O K with Ti = Tn = 300 OK.…”

Section: B Dissociative Recombinatioizmentioning

confidence: 99%

Atmospheric electron–ion and ion–ion recombination processes

Biondi¹

1969

Can. J. Chem.

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161

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The electron-ion and ion-ion recombination processes of importance in the upper atmosphere are considered, and available laboratory experimental and theoretical information concerning the relevant processes is discussed. For atomic ions the principal electron-ion recombination process is radiative, with theory indicating that the two-body coefficient at -200 "K is -10-" cm3/s and decreases with increasing electron temperature. Microwave afterglow/mass spectrometer studies of diatomic ionospheric ions (e.g. NOf, 02f., and N Z f ) show a loss by dissociative recombination with a coefficient substantially in excess of cm3/s at 250 "K and decreasing with increasing electron and ion temperature. There is some evidence from flame studies that H 3 0 f ions exhibit a very large coefficient (10-6-10-5 cm3!s) at 300 OK. Ion-ion recombination evidently proceeds by mutual neutralization, with laboratory studies of ions such as NOf and NO2-indicating a two-body coefficient of the order of cm3/s at 300 OK. In the lower D region, three-body Thomson recombination may be important, since laboratory studies of "air" ions indicate a three-body coefficient of -2 x cm6/s at 300 OK.

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“…where n e and n i are the electron and ion densities, D a is the ambipolar diffusion coefficient, α r the recombination coefficient, ν a is the attachment frequency and r is the radial [15] position. Since the plasma is quasineutral, we have n e ∼ = n i , so that the second term on the right-hand side may be replaced by (−α r n 2 e ).…”

Section: Electron Loss Processes In the Plasma Volumementioning

confidence: 99%