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Table A.1
Information on the chemical channels considered in this study that potentially produce escaping H, H2, C, N, O, N2, and CO in Triton’s dayside atmosphere.
| No. | Reaction | ΔE (eV) | k (s−1, cm3 s−1, cm6 s−1) | Φ (s−1) | Reference |
|---|---|---|---|---|---|
| Ra1 | CH4 + hv → CH3 + H | – | 3.87 × 10−9 | 2.36 × 1016 | Mordaunt et al. (1993) |
| Ra2/Rb1 | CH4 + hv → CH+H2 + H | – | 4.00 × 10−9 | 2.44 × 1016 | Mordaunt et al. (1993) |
| Ra3 | CH4 + CH → C2H4 + H | 2.58 | 5.00 × 10−11e200∕T | 1.21 × 1009 | Berman & Lin (1984) |
| Ra4 | NH + N → N2(X ) + H |
6.55 | 1.25 × 10−11 | 6.52 × 1012 | Miller et al. (1985); Krasnopolsky (*) |
NH+N → N2(A ) + H |
0.33 | 3.75 × 10−11 | 3.38 × 1013 | Miller et al. (1985); Krasnopolsky (*) | |
| Ra5 | N + H2 → N2H+ + H |
2.61 | 1.30 × 10−9 | 9.50 × 1023 | Anicich (1993) |
| Ra6 | N+ + H2 → NH+ + H | 3.10 | 3.00 × 10−10 | 1.97 × 1024 | Anicich (1993) |
| Ra7/Rf9 | N2H+ + e → N2 + H | 8.51 | 1.58 × 10−7 | 1.56 × 1024 | Mitchell (1990) |
| H2 | |||||
| Rb1/Ra2 | CH4 + hv → CH + H2 + H | – | 4.00 × 10−9 | 2.58 × 1016 | Mordaunt et al. (1993) |
| Rb2/Rc2 | CH4 + hv → C + H2 + H2 | – | 3.16 × 10−11 | 1.94 × 1014 | Braun et al. (1969) |
| Rb3 | H + H + M → H2 + M | 4.52 |  |
2.49 × 1012 | Tsang & Hampson (1986); Krasnopolsky (*) |
| Rb4/Rd5 | NH + H → N+H2 | 1.06 | 5.00 × 10−11 | 2.05 × 1010 | Morley (1981); Krasnopolsky (*) |
| C | |||||
| Rc1/Re1 | CO + hv → C(3P) + O(3P) | – | – | 1.98 × 1019 | McElroy & McConnell (1971); |
| CO+hv → C(1D) + O(1D) | – | – | 7.77 × 1018 | Chan et al. (1993); Visser et al. (2009) | |
| Rc2/Rb2 | CH4 + hv → C+H2 + H2 | – | 3.16 × 10−11 | 5.23 × 1011 | Braun et al. (1969) |
| Rc3 | CH+H → H2+C | 1.01 | 5.00 × 10−11 | 1.22 × 1009 | Harding et al. (1993); Krasnopolsky (*) |
| Rc4 | C2 + N → CN(X2Σ+) + C | 1.62 | 3.33 × 10−13 | 2.36 × 1015 | Krasnopolsky & Cruikshank (1995); Krasnopolsky (*) |
| C2 + N → CN(A2Π) + C | 0.49 | 6.67 × 10−13 | 1.63 × 1015 | Krasnopolsky & Cruikshank (1995); Krasnopolsky (*) | |
| Rc5/Rf2 | CN+N → N2 + C | 1.96 | 1.00 × 10−10 | 1.59 × 1016 | Whyte & Phillips (1983); Krasnopolsky (*) |
| Rc6 | CHCN+ + e → HCN+C | 7.05 | 2.60 × 10−7 | 1.66 × 1017 | Mitchell (1990) |
| Rc7/Re3 | CO+ + e → C(3P) + O(3P) | 2.90 | 1.29 × 10−7 | 5.55 × 1022 | Mitchell (1990); Rosén et al. (1998) |
| CO+ + e → C(1 D) + O(3 P) | 1.64 | 2.55 × 10−8 | 7.19 × 1021 | Mitchell (1990); Rosén et al. (1998) | |
| CO+ + e → C(3 P) + O(1 D) | 0.94 | 1.53 × 10−8 | 5.29 × 1021 | Mitchell (1990); Rosén et al. (1998) | |
| N | |||||
| Rd 1 | N2 + hv → N+N | – | – | 2.38 × 1024 | Shaw et al. (1992); Heays et al. (2014) |
| Rd 2 | N2 + hv → N + N+ + e | – | – | 6.34 × 1023 | Samson et al. (1987); Stolte et al. (1998) |
| Rd 3 | N2 + e (*) → N+N+e | 0.70 | – | 2.76 × 1024 | Strobel et al. (1990a) |
| Rd 4 | N2 + e (*) → N+N+ +2e | 0.69 | – | 4.07 × 1023 | Strobel et al. (1990a) |
| Rd 5/Rb 4 | NH + H → N+H2 | 1.06 | 5.00 × 10−11 | 7.22 × 1003 | Morley (1981); Krasnopolsky (*) |
| Rd 6 | N+ + CO → CO+ + N | 0.53 | 9.00 × 10−10 | 2.32 × 1022 | Anicich (1993) |
| Rd 7 | N +O → NO+ + N |
3.10 | 1.40 × 10−10 | 9.47 × 1022 | Anicich (1993) |
| Rd 8 | N + e → N(4 S) + N(2 D) |
3.44 | 2.11 × 10−8 | 4.49 × 1023 | Mitchell (1990); Peterson et al. (1998) |
N + e → N(4 S) + N(2 P) |
2.24 | 6.27 × 10−9 | 1.18 × 1023 | Mitchell (1990); Peterson et al. (1998) | |
N + e → N(2 D) + N(2 D) |
1.06 | 2.96 × 10−8 | 4.32 × 1023 | Mitchell (1990); Peterson et al. (1998) | |
| Rd 9/Re 4 | NO+ + e → N(4 S) + O(3 P) | 2.77 | 6.18 × 10−7 | 4.05 × 1023 | Mitchell (1990); Hellberg et al. (2003) |
| NO+ + e → N(2 D) + O(3 P) | 0.39 | 3.25 × 10−8 | 1.71 × 1021 | Mitchell (1990); Hellberg et al. (2003) | |
| O | |||||
| Re1/Rc1 | CO+hv → C(3P) + O(3P) | – | – | 1.81 × 1019 | McElroy & McConnell (1971); |
| CO+hv → C(1D) + O(1D) | – | – | 6.69 × 1018 | Chan et al. (1993); Visser et al. (2009) | |
| Re2/Rf6 | NO+N → N2+O | 3.22 | 3.00 × 10−11 | 3.33 × 1020 | Baulch et al. (1992); Krasnopolsky (*) |
| Re3/Rc7 | CO+ + e → C(3P) + O(3P) | 2.90 | 1.29 × 10−7 | 5.18 × 1022 | Mitchell (1990); Rosén et al. (1998) |
| CO+ + e → C(1D) + O(3P) | 1.64 | 2.55 × 10−8 | 7.81 × 1021 | Mitchell (1990); Rosén et al. (1998) | |
| CO+ + e → C(3P) + O(1D) | 0.94 | 1.53 × 10−8 | 3.51 × 1021 | Mitchell (1990); Rosén et al. (1998) | |
| Re4/Rd9 | NO+ + e → N(4S) + O(3P) | 2.77 | 6.18 × 10−7 | 7.89 × 1022 | Mitchell (1990); Hellberg et al. (2003) |
| NO+ + e → N(2D) + O(3P) | 0.39 | 3.25 × 10−8 | 9.54 × 1020 | Mitchell (1990); Hellberg et al. (2003) | |
| N2 | |||||
| Rf1 | N + N + M → N2 + M | 9.80 |  |
1.05 × 1017 | Campbell & Thrush (1967) |
| Rf2/Rc5 | CN+N → N2+C | 1.96 | 1.00 × 10−10 | 4.33 × 1015 | Whyte & Phillips (1983); Krasnopolsky (*) |
| Rf3 | CNN+N → N2+CN(X2Σ+) | 5.90 | 5.00 × 10−12 | 3.64 × 1014 | Krasnopolsky & Cruikshank (1995); Krasnopolsky (*) |
| CNN+N → N2+CN(A2Π) | 4.77 | 1.00 × 10−11 | 6.13 × 1014 | Krasnopolsky & Cruikshank (1995); Krasnopolsky (*) | |
| CNN+N → N2+CN(B2Σ) | 2.70 | 5.00 × 10−12 | 1.56 × 1014 | Krasnopolsky & Cruikshank (1995); Krasnopolsky (*) | |
| Rf4 | CNN+H → N2 + CH | 2.00 | 2.00 × 10−11 | 5.60 × 1010 | Krasnopolsky & Cruikshank (1995); Krasnopolsky (*) |
| Rf5/Rg2 | CNN+O → N2 + CO | 9.67 | 2.00 × 10−11 | 1.88 × 1014 | Krasnopolsky & Cruikshank (1995) |
| Rf6/Re2 | NO+N → N2+O | 3.22 | 3.00 × 10−11 | 8.60 × 1019 | Baulch et al. (1992); Krasnopolsky (*) |
| Rf7 | N + N → N+ + N2 |
1.04 | 1.00 × 10−11 | 7.48 × 1022 | Anicich (1993) |
| Rf8 | N2H+ + CO → HCO+ + N2 | 1.04 | 8.80 × 10−10 | 8.76 × 1019 | Anicich (1993) |
| Rf9/Ra7 | N2H+ + e → N2 + H | 8.51 | 6.30 × 10−7 | 6.14 × 1022 | Mitchell (1990) |
| CO | |||||
| Rg1 | CH2+O → H2 + CO | 7.78 | 2.00 × 10−10 | 9.37 × 1013 | Baulch et al. (1992) |
| Rg2/Rf5 | CNN+O → N2 + CO | 9.67 | 2.00 × 10−11 | 1.30 × 1014 | Krasnopolsky & Cruikshank (1995) |
| Rg3 | CO++O → O+ + CO | 0.39 | 1.40 × 10−10 | 5.23 × 1019 | Anicich (1993) |
| Rg4 | HCO+ + e → H + CO | 7.45 | 5.00 × 10−7 | 4.97 × 1020 | Mitchell (1990) |
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