Table 2. Rate Coefficients for Neutral and Ionic Gas-Phase Reactions in the Potassium Model.
| number | reaction | rate coefficienta |
|---|---|---|
| Neutral Chemistry | ||
| R1 | K + O3 → KO + O2 | 1.15 × 10–9 exp(−120/T) |
| R2 | KO + O → K + O2 | 2 × 10–10 exp(−120/T) |
| R3 | K + O2 (+M) → KO2 | (1.3 × 10–29)(T/200)−1.23 |
| R4 | KO + O3 → KO2 + O2 | 6.9 × 10–10 exp(−385/T) |
| R6 | KO2 + O → KO + O2 | 2 × 10–10 exp(−120/T) |
| R7 | KO + H2O → KOH + OH | 2 × 10–10 exp(−120/T) |
| R8 | KO + H2 → KOH + H | 2 × 10–10 exp(−120/T) |
| R9 | KO2 + H → K + HO2 | 2 × 10–10 exp(−120/T) |
| R10 | KOH + H → K + H2O | 2 × 10–10 exp(−120/T) |
| R11 | KOH + CO2 (+M) → KHCO3 | (7.1 × 10–28)(T/200)−4.2 |
| R12 | KHCO3 + H → K + H2CO3 | 4.5 × 10–11 exp(−3590/T) |
| R13 | KHCO3 + KHCO3 (+M) → dimer | 2.7 × 10–7 |
| Ion–Molecule Chemistry | ||
| R20 | K + NO+ → K+ + NO | 9.4 × 10–10 |
| R21 | K + O2+ → K+ + O2 | 3.2 × 10–9 |
| R22 | K+ + N2 (+M) → K+·N2 | (2.3 × 10–30)(T/200)−2.39 |
| R–22 | K+·N2 (+M) → K+ + N2 | 2.8 × 10–8 exp(−1680/T) |
| R23 | K+ + O2 (+M) → K+·O2 | (1.2 × 10–30)(T/200)−2.12 |
| R–23 | K+·O2+ (+M) → K+ + O2 | 1.5 × 10–9 exp(−820/T) |
| R24 | K+ + O (+M) → K+·O+ | (8.8 × 10–32)(T/200)−1.28 |
| R–24 | K+·O+ (+M) → K+ + O | 2.6 × 10–10 exp(−1800/T) |
| R25 | K+ + CO2 (+M) → K+·CO2 | (1.3 × 10–29)(T/200)−2.43 |
| R26 | K+ + H2O (+M) → K+·H2O | (3.0 × 10–29)(T/200)−2.22 |
| R27 | K+·N2 + O → K+·O + N2 | (2.9 × 10–10)(T/200)−0.17 |
| R–27 | K+·O + N2 → K+·N2 + O | (2.5 × 10–11)(T/200)−0.55 |
| R28 | K+·N2 + CO2 → K+·CO2 + N2 | (4.8 × 10–10)(T/200)−0.88 |
| R–28 | K+·CO2 + N2 → K+·N2 + CO2 | 2.8 × 10–10 exp(−2220/T) |
| R29 | K+·O2 + O → K+·O + O2 | (2.8 × 10–10)(T/200)−0.42 |
| R–29 | K+·O + O2 → K+·O2 + O | 5.0 × 10–10 exp(−752/T) |
| R30 | K+·O + CO2 → K+·CO2 + O | (7.1 × 10–10)(T/200)−0.21 |
| R–30 | K+·CO2 + O → K+·O + CO2 | 1.4 × 10–9 exp(−2200/T) |
| R31 | K+·O + H2O → K+·H2O + O | 7.1 × 10–10 (T/200 K)−1.90 |
| R32 | K+·O2 + N2 → K+·N2 + O2 | (1.6 × 10–10)(T/200)−0.90 |
| R–32 | K+·N2 + O2 → K+·O2 + N2 | 1.0 × 10–9 exp (−873/T) |
| R33 | K+·O2 + CO2 → K+·CO2 + O2 | (1.5 × 10–10)(T/200)−1.94 |
| R34 | K+·O2 + H2O → K+·H2O + O2 | (1.8 × 10–9)(T/200)−0.99 |
| R35 | K+·N2 + H2O → K+·H2O + N2 | (2.4 × 10–9)(T/200)−0.45 |
| R36 | K+·CO2 + H2O → K+·H2O + CO2 | (1.4 × 10–9)(T/200)−1.26 |
| R37 | K+·X + e– → K + X (X = O, O2, N2, CO2, H2O) | (1 × 10–6)(T/200)−1/2 |
| Photochemical Reactions | ||
| R38 | KO2 + hν → K + O2 | 2.2 × 10–3 |
| R39 | KOH + hν → K + OH | 2.7 × 10–2 |
| R40 | KHCO3 + hν → K + HCO3 | 1.2 × 10–4 |
| R41 | K + hν → K+ + e– | 4 × 10–5 |
a
Units: unimolecular, s–1; bimolecular, cm3 molecule–1 s–1; termolecular, cm6 molecule–2 s–1. Rate coefficients are from Plane et al.103