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Table 1

Reaction rates included in the chemical mechanism for the neutralising trail.

No. Reaction A η Ea∕kB Reference
[m3 mol−1 s−1] [-] [K]
Charge exchange
1. Mg+ + O3 ⇌ MgO+ + O2 7.23 × 108 0.0 0 1
2. MgO+ + O ⇌ Mg+ + O2 3.55 × 108 0.0 0 1
3. Mg+ + N2 + M ⇌Mg+ ⋅N2 + M 5.8 × 109 –1.72 0 1
4. Mg+ ⋅N2 + O2 ⇌ MgO + N2 2.11 × 106 0.0 0 1
5. Mg+ + O2 + M ⇌ MgO + M 5.44 × 109 –1.65 0 1
6. MgO + O ⇌ MgO+ + O2 3.91 × 108 0.0 0 1
7. MgO+ + O3 ⇌ Mg+ + 2O2 1.08 × 108 0.0 0 1
8. MgO+ + O3 ⇌ MgO + O2 1.99 × 108 0.0 0 1
9. Fe+ + O3 ⇌ FeO+ + O2 4.58 × 108 0.0 241 2
10. Fe+ + N2 + M ⇌Fe+ ⋅N2 + M 8.66 × 109 –1.52 0 2
11. Fe+ ⋅N2 + O ⇌ FeO+ + N2 3.01 × 107 0.0 0 2
12. FeO + O ⇌ FeO+ + O2 3.01 × 107 0.0 0 2
13. Fe+ + O2 + M ⇌ FeO + M 1.22 × 1011 –1.86 0 2
14. Na+ + N2 + M ⇌ + M 2.01 × 1011 –2.2 0 3
           
Dissociative recombination
15. MgO+ + e− ⇌ Mg + O 2.55 × 1012 –0.5 0 4
16. Mg+ ⋅N2 + e− ⇌ Mg + N2 2.55 × 1011 –0.5 0 4
17. FeO+ + e− ⇌ Fe + O 2.55 × 1012 –0.5 0 2
18. FeO + e− ⇌ Fe + O2 2.55 × 1011 –0.5 0 2
19. + e− ⇌ Na + N2 8.52 × 1011 –0.5 0 3
           
Electron impact ionisation
20. Mg + e− ⇌ Mg+ + 2e− 3.22 × 1011 –0.5 88 696 5
21. Fe + e− ⇌ Fe+ + 2e− 1.95 × 1011 –0.5 91 246 5
22. Na + e− ⇌ Na+ + 2e− 1.21 × 1011 –0.5 59 594 5

Notes. Forward rates, kf, are computed according to Eq. (13). Backward rates, kb, are computed starting from the available forward rates and thermodynamic equilibrium properties in order to satisfy equilibrium.

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