Energy partitionning in charge transfer reactions at thermal energies

Marx, R.; Mauclaire, G.; Derai, R.

doi:10.1016/0020-7381(83)87159-9

Cited by 41 publications

(17 citation statements)

References 3 publications

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“…m . dependence of the cross section for 0 + formed by reaction (7) [0'3/2 (0 + )] is similar to that for 0'3/2 (CO + ). The value for 0'3/2 (0 + ) is peaked at E c .…”

Section: Absolute Cross Sections For 0+mentioning

confidence: 56%

“…m . ::::; 40 e V with a value 0.72 A 2 , which is about 35% greater than the maximum cross section observed for the formation of 0 + from reaction (7).…”

Section: Absolute Cross Sections For C+mentioning

confidence: 68%

“…is decreased toward the threshold for reaction (7). However, the low intensities of 0 + observed near the threshold for reaction (7) prevent accurate measurements of the 0'1/2 (0 + )/0'312 (0 + ) ratio at E c . m .…”

Section: Absolute Cross Sections For 0+mentioning

confidence: 99%

“…As discussed above, C + ions are most likely produced by reaction (8), which has a significantly higher threshold than those for reactions (6) and (7). Therefore, the total energy available to be distributed between the internal and kinetic energies of the products is smaller for the process [reaction (8)] responsible for the formation of C + than those for the formation of CO + + 0 [reaction (6)] or 0 + + CO [reaction (7)] .…”

Section: Translational Energy Distributions Of Product Ionsmentioning

confidence: 99%

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Absolute state-selected and state-to-state total cross sections for the Ar+(2P3/2,1/2)+CO2 reactions

Flesch

1992

The Journal of Chemical Physics

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Absolute stateselected and statetostate total cross sections for the Ar+(2 P 3/2,1/2)+CO reactions J. Chem. Phys. 95, 3381 (1991); 10.1063/1.460843Experimental and theoretical total stateselected and statetostate absolute cross sections. II. The Ar+(2 P 3/2,1/2)+H2 reaction J. Chem. Phys. 93, 4832 (1990); 10.1063/1.459671Experimental and theoretical total stateselected and statetostate absolute cross sections. I. The H+ 2(X,v')+Ar reaction Absolute stateselected and statetostate total cross sections for the reaction Ar+(2 P 3/2,1/2)+O2 Absolute statetostate total cross sections for the reactions N+ 2(X,v'=0-2) +Ar(1 S 0)→N2(X,v)+Ar+(2 P 3/2,1/2) Absolute spin-orbit state-selected total cross sections for the reactions, Ar + (2 P3/2.112) + CO 2 -+ CO 2 + + Ar [reaction (1)], CO + + 0 + Ar [reaction (2) ], o + + CO + Ar [reaction (3) ], C++ 20 + Ar [reaction (4)], ArC + + 20 [reaction (5)],ArO + + CO [reaction (6)], and ArCO + + 0 [reaction (7)] have been measured in the center-of-mass collision energy (E c . m . ) range of 0.26-131 e V. The ratio of the charge-transfer cross section due to Ar + e P I12 ) to that associated with Ar + e P3(2 ) varies in the range of 0.5-0.8. The appearance energies observed for CO + (E c . m . = 4.2 ± 0.5 eV), 0 + (E c . m . = 3.7 ± 0.5 eV), and C + (E c . m . = 12.6 ± 0.5 eV) are in agreement with the thermochemical thresholds for reactions (2), (3), and (4), respectively. The comparison of the absolute cross sections for CO + , 0 + , and C + from CO 2 by photoionization and by dissociative charge transfer [reactions (2)-(4)] is made. The kinetic-energy analysis of product cot, CO +,0 +, C +, ArO +, and ArC + suggests that reactions (2)-(7) proceed via a charge-transfer predissociation mechanism. This experiment, together with the previous studies of Ar+ ep3/2.112) + N2 (02'CO), supports the conclusion that product ions formed by dissociative photoionization are also produced by dissociative charge transfer. We find that the absolute cross sections for product ions formed in the dissociative charge-transfer processes [reactions (2 )-( 4)] are substantially greater than those formed in the dissociative photoionization of CO 2 , a finding consistent with the general observation that photo ionization cross sections are significantly smaller than charge-transfer cross sections. The relative cross sections for CO + ,0 + , and C + formed by reactions (2)-( 4) are also found to be different from those for photoionization of CO 2 ' This difference is attributed to the anisotropic interaction potential surface responsible for the Ar + ep3(2,1I2) + CO 2 reactions.162

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“…m . dependence of the cross section for 0 + formed by reaction (7) [0'3/2 (0 + )] is similar to that for 0'3/2 (CO + ). The value for 0'3/2 (0 + ) is peaked at E c .…”

Section: Absolute Cross Sections For 0+mentioning

confidence: 56%

“…m . ::::; 40 e V with a value 0.72 A 2 , which is about 35% greater than the maximum cross section observed for the formation of 0 + from reaction (7).…”

Section: Absolute Cross Sections For C+mentioning

confidence: 68%

Section: Absolute Cross Sections For 0+mentioning

confidence: 99%

Section: Translational Energy Distributions Of Product Ionsmentioning

confidence: 99%

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Absolute state-selected and state-to-state total cross sections for the Ar+(2P3/2,1/2)+CO2 reactions

Flesch

1992

The Journal of Chemical Physics

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“…If this is true, the reverse reaction is not possible, since the required energy would be lost in the radiative deactivation of N2 +(A) to the ground state N2 +(X) before reacting with O. This argument is supported by the experimental data of Marx et al [1983], which show that exothermicity typically is almost equally divided between internal (electronic and/or vibrational) and kinetic energy for the products. It is also generally accepted that as a rule, energy is transferred between products according to Franck-Condon principles.…”

Section: Led and If So A New Source For No + At Night Has To Be Foundmentioning

confidence: 95%

Results of a comprehensive study of the photochemistry of N₂⁺ in the ionosphere

Abdou¹,

Torr²,

Richards³

et al. 1984

J. Geophys. Res.

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The disagreement between model calculations of ionospheric N2+ concentrations and those measured by the Atmosphere Explorer (AE) satellite has been controversial for several years. The model calculations of N2+ require an additional loss of the order of ∼10² ions cm−3 s−1 at ∼250 km in order to account for the observed N2+ concentrations. After analysis of many orbits of AE data we have drawn the conclusion that such a loss rate could only be provided by either (1) enhancing the ionospheric dissociative recombination rate coefficient for N2+ by a factor of 2–3 over its currently accepted value if this is not precluded by laboratory data or (2) enhancing of the charge exchange of N2+ with atomic oxygen. This could be achieved by two mechanisms which either independently or combined can account for the observed N2+ concentrations. The first is the enhanced destruction of N2+ by charge exchange of vibrationally excited N2+ with O (enhancement of the branch to NO+ only transfers the problem to NO+). The second mechanism is the accidentally energetically resonant reaction O+(²D) + N2 ⇄ N2+(X)υ=5 + O. In spite of the valid theoretical arguments against the plausibility of these two mechanisms, without any viable alternatives we feel compelled to present our results. The best agreement between theory and data is obtained when these two mechanisms are combined with the rate coefficients for charge exchange of vibrationally excited N2+ with O increased by a factor of 50 and N2 set equal to 2.5×10−10 cm³ s−1 and where N2+(X)υ>0 is quenched by N2 at a rate of ∼5×10−10 cm³ s−1. An important aspect of the chemical scheme is negligible quenching of O+(²D) by O. We estimate an upper limit for the rate coefficient of this process to be ∼5×10−12 cm³ s−1.

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State‐Selected and State‐to‐State Ion‐Molecular Reaction Dynamics by Photoionization and Differential Reactivity Methods

1992

Advances in Chemical Physics

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Energy partitionning in charge transfer reactions at thermal energies

Cited by 41 publications

References 3 publications

Absolute state-selected and state-to-state total cross sections for the Ar+(2P3/2,1/2)+CO2 reactions

Absolute state-selected and state-to-state total cross sections for the Ar+(2P3/2,1/2)+CO2 reactions

Results of a comprehensive study of the photochemistry of N₂⁺ in the ionosphere

State‐Selected and State‐to‐State Ion‐Molecular Reaction Dynamics by Photoionization and Differential Reactivity Methods

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Energy partitionning in charge transfer reactions at thermal energies

Cited by 41 publications

References 3 publications

Absolute state-selected and state-to-state total cross sections for the Ar+(2P3/2,1/2)+CO2 reactions

Absolute state-selected and state-to-state total cross sections for the Ar+(2P3/2,1/2)+CO2 reactions

Results of a comprehensive study of the photochemistry of N2+ in the ionosphere

State‐Selected and State‐to‐State Ion‐Molecular Reaction Dynamics by Photoionization and Differential Reactivity Methods

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Product

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Results of a comprehensive study of the photochemistry of N₂⁺ in the ionosphere