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Table A.1

Information on the exothermic reactions considered in this study that potentially produce escaping N(4S), N(2D), 3CH2, CH3, NH, CH4, NH3, C2H2, C2H3, HCN, C2H4, N2, C2H5, and C2H6 in Titan’s dayside upper atmosphere.

No. Reaction ΔE k Φesc References
(eV) (cm3 s−1) (s−1)
Ra 1/Rj 2 N(2D) + N2 → N(4S) + N2 1.58 1.70 × 10−14 6.43 × 1023 0.708 1
Ra 2/Re 7 NH + CH3 → N(4S) + CH4 0.67 1.00 × 10−11 1.03 × 1023 0.113 20
Ra 3 N+ + CH4 → N(4S) + CH 1.08 5.00 × 10−11 5.34 × 1021 5.88 × 10−3 2, 10
Ra 4 N+ + HCN → N(4S) + HCN+ 0.62 2.40 × 10−9 8.68 × 1020 9.56 × 10−4 3
Ra 5 N + e → N(4S) + N(2D) 1.73 2.26 × 1022 0.025 4, 5
Ra 6 N + e → 2 N(2D) 0.53 5.94 × 1021 6.54 × 10−4 4, 5
Ra 7 CN+ + e → N(4S) + C 3.39 2.71 × 1017 2.99 × 10−7 6
Ra 8 CN+ + e → N(2D) + C 2.11 2.88 × 1018 3.17 × 10−6 6
Ra 9/Rc 8 N2H+ + e → N(4S) + NH 1.11 8.53 × 1020 9.38 × 10−4 7
Ra 10 CNC+ + e → N(4S) + C2 2.03 7.30 × 1019 8.04 × 10−5 7

3CH2

Rb 1 H2 + C + M → 3CH2 + M 2.26 k0 = 2.50 × 10−28 4.60 × 1018 1.07 × 10−5 8, 9
k = 1.41 × 10−11
kR = 6.00 × 10−16
Fc = 0.40
Rb 2 N+ + C2H43CH2 + HCNH+ 4.13 1.58 × 10−10 6.31 × 1019 1.47 × 10−4 10
Rb 3 C2H + e → 3CH2 + CH 0.67 4.70 × 1019 1.10 × 10−4 11
Rb 4 C2H + e → 2 3CH2 1.52 2.15 × 1021 5.02 × 10−3 12
Rb 5/Rd 29 C2H + e → 3CH2 + CH3 2.02 1.51 × 1022 0.035 13, 14
Rb 6/Re 20 C2H + e → 3CH2 + CH4 3.98 3.55 × 1013 8.27 × 10−12 15, 16
Rb 7/Rg 22 C3H + e → 3CH2 + C2H2 3.89 6.51 × 1019 1.52 × 10−4 17
Rb 8/Ri 5 C3H + e → 3CH2 + C2H3 1.90 2.75 × 1020 6.40 × 10−4 15, 16
Rb 9/Rk 28 C3H + e → 3CH2 + C2H4 3.64 1.05 × 1016 2.45 × 10−8 18
Rb 10/Rm 9 C3H + e → 3CH2 + C2H6 5.46 7.76 × 1019 1.81 × 10−4 15

NH

Rc 1 H + N + M → NH + M 2.26 k0 = 5.00 × 10−32 3.19 × 1018 3.52 × 10−6 15, 19
k = 5.00 × 10−16
kR = 5.00 × 10−16
Fc = 0.40
Rc 2/Rg 21 N(4S) + C2H3 → NH + C2H2 1.23 1.31 × 10−11 1.94 × 1020 2.13 × 10−4 10, 21
Rc 3/Rk 21 N(4S) + C2H5 → NH + C2H4 1.25 7.10 × 10−11 4.17 × 1022 0.046 22
Rc 4 N(2D) + NH3 → NH + NH2 0.59 5.00 × 10−11 1.50 × 1020 1.65 × 10−4 1
Rc 5/Rd 19 N(2D) + CH4 → NH + CH3 0.69 6.47 × 10−14 2.77 × 1022 0.031 1
Rc 6 2 NH2 → NH + NH3 0.38 7.05 × 10−17 3.71 × 1013 4.09 × 10−11 23, 76
Rc 7 NH + e → NH + H 0.45 3.42 × 1018 3.76 × 10−6 24, 25
Rc 8/Ra 9 N2H+ + e → N(4S) + NH 1.04 1.57 × 1020 1.73 × 10−4 7

CH3

Rd 1 H + 3CH2 + M → CH3 + M 2.98 k0 = 2.06 × 10−29 4.61 × 1011 1.08 × 10−12 27, 28, 29
k = 1.76 × 10−9
Rd 2 H2 + CH + M → CH3 + M 2.90 k0 = 1.73 × 10−30 1.98 × 1018 4.61 × 10−6 15, 30
k = 1.13 × 10−10
kR = 6.00 × 10−16
Fc = 0.63
Rd 3/Rk 3 CH + C2H6 → CH3 + C2H4 2.30 3.09 × 10−10 9.04 × 1020 2.11 × 10−3 31, 68
Rd 4 CH + C3H8 → CH3 + C3H6 2.41 9.21 × 10−11 8.10 × 1018 1.89 × 10−6 32, 70
Rd 5 CH + C4H10 → CH3 + C4H8 2.58 2.89 × 10−10 7.20 × 1015 1.68 × 10−9 32, 70
Rd 6/Rg 4 1CH2 + C2H3 → CH3 + C2H2 3.66 3.00 × 10−11 3.23 × 1018 7.53 × 10−6 37
Rd 7/Rk 4 1CH2 + C2H5 → CH3 + C2H4 2.56 1.50 × 10−11 5.09 × 1019 1.19 × 10−4 37
Rd 8 1CH2 + C2H6 → CH3 + C2H5 0.50 2.46 × 10−10 9.25 × 1020 2.16 × 10−3 27, 71
Rd 9 1CH2 + C3H7 → CH3 + C3H6 2.68 1.71 × 10−11 3.13 × 1014 7.29 × 10−10 38
Rd 10/Rg 6 3CH2 + C2H3 → CH3 + C2H2 3.41 3.00 × 10−11 4.22 × 1019 9.84 × 10−5 37
Rd 11/Rk 7 3CH2 + C2H5 → CH3 + C2H4 2.28 3.00 × 10−11 1.31 × 1021 3.06 × 10−3 37
Rd 12 3CH2 + C3H7 → CH3 + C3H6 2.40 3.00 × 10−12 6.89 × 1014 1.61 × 10−9 38
Rd 13 C2H + CH4 → CH3 + C2H2 0.73 4.49 × 10−13 1.62 × 1021 3.79 × 10−3 34
Rd 14 C2H + C2H5 → CH3 + C3H3 1.44 3.00 × 10−11 2.06 × 1019 4.81 × 10−5 37
Rd 15 C2H + CH3CCH → CH3 + C4H2 1.06 1.55 × 10−10 2.57 × 1019 5.99 × 10−5 72, 73
Rd 16/Rh 2 N(4S) + C2H4 → CH3 + HCN 1.62 3.18 × 10−16 9.70 × 1019 2.26 × 10−4 35
Rd 17 N(4S) + C2H5 → CH3 + H2CN 1.34 3.90 × 10−11 2.37 × 1022 0.055 22
Rd 18 N(4S) + CH3CCH → CH3 + CHCN 2.25 8.01 × 10−16 1.89 × 1017 4.40 × 10−7 35
Rd 19/Rc 5 N(2D) + CH4 → CH3 + NH 0.69 6.47 × 10−14 2.77 × 1022 0.065 1
Rd 20 CN + CH4 → CH3 + HCN 0.50 6.37 × 10−14 5.78 × 1019 1.35 × 10−4 41, 69
Rd 21 C2N + CH4 → CH3 + CHCN 0.97 6.00 × 10−14 2.42 × 1019 5.65 × 10−5 60
Rd 22 CH3CN + C2H → CH3 + HC3N 2.09 1.06 × 10−13 1.64 × 1016 3.83 × 10−8 26
Rd 23 C2H + C2H4 → CH3 + C3H 0.40 7.03 × 10−10 4.67 × 1021 0.011 3
Rd 24 N+ + CH4 → CH3 + NH+ 1.43 5.00 × 10−10 1.40 × 1022 0.033 10, 26
Rd 25 HCN+ + CH4 → CH3 + HCNH+ 1.90 1.14 × 10−9 2.26 × 1022 0.053 3
Rd 26 CH + e → CH3 + H 0.50 1.44 × 1020 3.37 × 10−4 25
Rd 27 C2H + e → CH3 + C 1.19 1.33 × 1019 3.10 × 10−5 11
Rd 28 C2H + e → CH3 + CH 0.42 2.33 × 1020 5.45 × 10−5 12
Rd 29/Rb 5 C2H + e → CH3 + 3CH2 1.89 1.43 × 1022 0.034 13, 14
Rd 30 C2H + e → 2 CH3 3.40 1.20 × 1013 2.81 × 10−11 15, 16
Rd 31/Re 21 C2H + e → CH3 + CH4 4.20 2.38 × 1020 5.56 × 10−4 15
Rd 32/Rg 23 C3H + e → CH3 + C2H2 4.43 6.41 × 1020 1.50 × 10−3 15, 16
Rd 33/Ri 6 C3H + e → CH3 + C2H3 3.69 1.07 × 1015 2.50 × 10−9 18
Rd 34/Rk 29 C3H + e → CH3 + C2H4 5.41 3.03 × 1020 7.06 × 10−4 12
Rd 35/Rl 7 C3H + e → CH3 + C2H5 5.31 7.46 × 1019 1.74 × 10−4 18
Rd 36/Rm 10 C3H + e → CH3 + C2H6 5.34 3.07 × 1019 7.17 × 10−5 15
Rd 37/Rf 2 CH3NH + e → CH3 + NH3 2.92 2.60 × 1020 6.08 × 10−4 15, 42

CH4

Re 1 H + CH3 + M → CH4 + M 2.87 k0 = 1.62 × 10−28 1.36 × 1018 3.17 × 10−6 33, 77
k = 2.95 × 10−10
kR = 1.80 × 10−16
Fc = 0.56
Re 2/Rg 7 CH3 + C2H3 → CH4 + C2H2 1.88 1.95 × 10−10 3.44 × 1021 8.03 × 10−3 45, 78
Re 3/Rk 9 CH3 + C2H5 → CH4 + C2H4 1.92 6.87 × 10−12 4.88 × 1021 0.011 15, 26
Re 4 CH3 + C3H5 → CH4 + CH2CCH2 1.49 1.56 × 10−12 1.53 × 1020 3.57 × 10−4 39
Re 5 CH3 + C3H6 → CH4 + C3H5 0.53 4.85 × 10−26 2.86 × 104 6.67 × 10−20 36
Re 6 CH3 + C3H7 → CH4 + C3H6 2.19 1.00 × 10−11 3.90 × 1016 9.11 × 10−8 15, 38
Re 7/Ra 2 CH3 + NH → CH4 + N(4S) 0.59 1.00 × 10−11 3.88 × 1022 0.091 20
Re 8 CH + C2H6 → CH4 + C2H 1.22 1.43 × 10−9 5.35 × 1020 1.25 × 10−3 3
Re 9 CH + C2H2 → CH4 + C2H 0.67 1.44 × 10−9 2.04 × 1021 4.77 × 10−3 3
Re 10 CH + C2H4 → CH4 + C2H 1.28 1.70 × 10−9 4.17 × 1021 9.73 × 10−3 3
Re 11 CH + C2H2 → CH4 + C2H 0.57 1.48 × 10−9 2.50 × 1022 0.058 3
Re 12 CH + C2H4 → CH4 + C2H 0.84 1.50 × 10−9 3.86 × 1022 0.090 3
Re 13 CH + HCN → CH4 + HCNH+ 1.10 5.80 × 10−9 1.30 × 1023 0.304 15
Re 14 C2H + C2H2 → CH4 + c-C3H 0.96 6.84 × 10−11 1.50 × 1021 3.51 × 10−3 3
Re 15 C2H + C2H4 → CH4 + C3H 0.63 3.55 × 10−10 7.83 × 1021 0.018 3
Re 16 N+ + C2H6 → CH4 + HCNH+ 6.10 1.60 × 10−10 7.20 × 1018 1.68 × 10−5 10
Re 17 CH + e → CH4 + H 0.49 3.11 × 1021 7.26 × 10−3 50, 51
Re 18 C2H + e → CH4 + C 1.92 3.03 × 1020 7.07 × 10−4 12
Re 19 C2H + e → CH4 + CH 1.79 6.73 × 1021 0.016 13, 14
Re 20/Rb 6 C2H + e → CH4 + 3CH2 3.48 6.17 × 1012 1.44 × 10−11 15, 16
Re 21/Rd 31 C2H + e → CH4 + CH3 3.94 2.25 × 1020 5.25 × 10−4 15
Re 22 C3H + e → CH4 + C2 2.28 1.97 × 1018 4.60 × 10−6 17
Re 23 C3H + e → CH4 + C2H 3.46 4.83 × 1020 1.13 × 10−3 15, 16

NH3

Rf 1 NH2 + H + M → NH3 +M 1.78 k0 = 2.52 × 10−28 6.11 × 1015 6.73 × 10−9 15, 54, 64
k = 2.84 × 10−10
kR = 2.82 × 10−16
Fc = 0.42
Rf 2/Rd 37 CH3NH + e → NH3 + CH3 2.58 2.25 × 1020 2.48 × 10−4 15, 42

C2H2

Rg 1 H + C2H + M → C2H2 +M 2.99 k0 = 9.00 × 10−26 1.66 × 1015 7.74 × 10−9 37, 79
k = 1.85 × 10−10
kR = 1.00 × 10−13
Fc = 0.40
Rg 2 H + C6H5 → C2H2 + C4H4 2.03 6.08 × 10−12 1.65 × 1015 7.68 × 10−9 65
Rg 3 1CH2 + C2H → C2H2 + CH 1.03 3.00 × 10−11 3.19 × 1018 1.49 × 10−5 37
Rg 4/Rd 6 1CH2 + C2H3 → C2H2 + CH3 2.11 3.00 × 10−11 1.34 × 1018 6.27 × 10−6 37
Rg 5 3CH2 + C2H → C2H2 + CH 0.90 3.00 × 10−11 4.11 × 1019 1.92 × 10−4 37
Rg 6/Rd 10 3CH2 + C2H3 → C2H2 + CH3 1.97 3.00 × 10−11 1.78 × 1019 8.30 × 10−5 37
Rg 7/Re 2 CH3 + C2H3 → C2H2 + CH4 1.16 1.95 × 10−10 1.51 × 1021 7.09 × 10−3 45, 78
Rg 8 C2H + C2H3 → 2 C2H2 2.13 1.60 × 10−12 3.67 × 1016 1.71 × 10−7 37
Rg 9/Rk 10 C2H + C2H5 → C2H2 + C2H4 2.19 3.00 × 10−12 1.40 × 1018 6.55 × 10−6 37
Rg 10/Rl 4 C2H + C2H6 → C2H2 + C2H5 0.73 4.15 × 10−11 1.37 × 1019 6.37 × 10−5 34, 52
Rg 11 C2H + CH2CCH2 → C2H2 + C3H3 1.16 2.58 × 10−10 2.88 × 1019 1.34 × 10−4 60
Rg 12 C2H + C3H5 → C2H2 + CH2CCH2 2.00 1.20 × 10−11 8.15 × 1017 3.80 × 10−6 39
Rg 13 C2H + C3H7 → C2H2 + C3H6 2.61 1.00 × 10−11 2.71 × 1013 1.27 × 10−11 38
Rg 14 C2H + C3H8 → C2H2 + C3H7 0.93 6.10 × 10−11 5.73 × 1016 2.67 × 10−7 34, 52
Rg 15 C2H + C4H1 0 → C2H2 + C4H9 0.88 1.15 × 10−10 1.51 × 1013 7.07 × 10−11 53, 75
Rg 16/Rk 11 2 C2H3 → C2H2 + C2H4 1.72 3.50 × 10−11 9.72 × 1016 4.53 × 10−7 66
Rg 17/Rm 3 C2H3 + C2H5 → C2H2 + C2H6 1.76 8.00 × 10−13 8.96 × 1016 4.18 × 10−7 37
Rg 18 C2H3 + C3H3 → C2H2 + CH3CCH 1.44 8.00 × 10−12 3.09 × 1016 1.44 × 10−7 27, 44
Rg 19 C2H3 + C3H5 → C2H2 + C3H6 1.43 8.00 × 10−12 1.17 × 1017 5.44 × 10−7 39
Rg 20 C2H3 + C3H7 → C2H2 + C3H8 1.73 2.00 × 10−12 1.03 × 1012 4.79 × 10−12 38
Rg 21/Rc 2 N(4S) + C2H3 → C2H2 + NH 0.71 1.31 × 10−11 7.88 × 1019 3.68 × 10−4 10, 21
Rg 22/Rb 7 C3H + e → C2H2 + 3CH2 2.09 1.37 × 1019 6.40 × 10−5 17
Rg 23/Rd 32 C3H + e → C2H2 + CH3 2.56 1.71 × 1020 8.00 × 10−4 15, 16

HCN

Rh 1 H + CN + M → HCN +M 2.74 k0 = 8.78 × 10−31 3.94 × 1016 4.33 × 10−8∕9.19 × 10−8 40
k = 2.44 × 10−10
kR = 1.00 × 10−13
Fc = 0.40
Rh 2/Rd 16 N(4S) + C2H4 → HCN + CH3 0.90 3.18 × 10−16 1.62 × 1018 1.78 × 10−6∕3.78 × 10−5 35
Rh 3 CN + C3H8 → HCN + C3H7 0.67 1.18 × 10−10 9.91 × 1015 1.09 × 10−8∕2.31 × 10−9 46, 74
Rh 4 CN + CH2NH → HCN + H2CN 0.76 2.80 × 10−11 3.30 × 1017 3.62 × 10−7∕7.70 × 10−7 55, 75
Rh 5 CH + HC3N → HCN + c-C3H 1.45 1.43 × 10−9 2.53 × 1017 2.79 × 10−7∕5.91 × 10−7 3
Rh 6 CN+ + CH4 → HCN + CH 1.83 5.00 × 10−10 3.51 × 1018 3.86 × 10−6∕8.19 × 10−6 3
Rh 7 HCN+ + C2H2 → HCN + C2H 1.07 1.15 × 10−9 1.37 × 1019 1.51 × 10−5∕3.20 × 10−5 3
Rh 8 CNC+ + C2H4 → HCN + c-C3H 2.86 1.95 × 10−10 1.07 × 1018 1.18 × 10−6∕2.50 × 10−6 43
Rh 9 HCNH+ + C3H3N → HCN + C3H4N+ 1.14 4.50 × 10−9 2.02 × 1018 2.22 × 10−6∕4.70 × 10−6 56, 57

C2H3

Ri 1 H + C2H2 + M → C2H3 +M 0.77 k0 = 5.88 × 10−30 3.79 × 1013 1.77 × 10−10 32, 77
k = 3.74 × 10−15
kR = 2.16 × 10−18
Fc = 0.18
Ri 2/Rk 5 1CH2 + C3H5 → C2H3 + C2H4 1.25 6.67 × 10−11 1.34 × 1019 6.07 × 10−5 39
Ri 3 C2H3CN + C2 → C2H3 + C3N 1.62 4.4 × 10−10 3.53 × 1015 1.65 × 10−8 49, 59
Ri 4 C3H + e → C2H3 + CH 2.09 4.51 × 1018 2.10 × 10−5 17
Ri 5/Rb 8 C3H + e → C2H3 + 3CH2 0.99 8.31 × 1019 3.37 × 10−4 15, 16
Ri 6/Rd 33 C3H + e → C2H3 + CH3 2.05 4.70 × 1014 1.92 × 10−8 18
Ri 7/Rm 11 C4H + e → C2H3 + C2H6 3.69 8.15 × 1018 3.81 × 10−5 18, 48

N2

Rj 1 2 N(4S) + M → N2 + M 4.91 k0 = 4.46 × 10−32 4.63 × 1019 1.02 × 10−4 58
k = 5.00 × 10−16
kR = 5.00 × 10−16
Fc = 0.40
Rj 2/Ra 1 N(2D) + N2 → N2 + N(4S) 0.79 1.70 × 10−14 2.53 × 1022 0.056 1
Rj 3 N+ + HCN → N2 + CH+ 1.28 1.29 × 10−9 1.11 × 1020 2.43 × 10−4 3
Rj 4 N + C2H2 → N2 + C2H 2.02 9.40 × 10−10 1.93 × 1021 4.26 × 10−3 10
Rj 5 N + HCN → N2 + HCN+ 0.99 3.90 × 10−10 4.31 × 1020 9.48 × 10−4 3
Rj 6 N2H+ + HCN → N2 + HCNH+ 1.16 3.20 × 10−9 4.48 × 1020 9.86 × 10−4 3

C2H4

Rk 1 H + C2H3 + M → C2H4 +M 2.40 k0 = 8.54 × 10−27 1.51 × 1012 7.08 × 10−12 47
k = 1.76 × 10−10
Rk 2 C + CH4 + M → C2H4 + M 3.06 2.00 × 10−15 4.37 × 1019 2.04 × 10−4 67
Rk 3/Rd 3 CH + C2H6 → C2H4 + CH3 1.23 3.09 × 10−10 4.13 × 1020 1.93 × 10−3 31, 68
Rk 4/Rd 7 1CH2 + C2H5 → C2H4 + CH3 1.37 1.50 × 10−11 2.41 × 1019 1.13 × 10−4 37
Rk 5/Ri 2 1CH2 + C3H5 → C2H4 + C2H3 1.21 6.67 × 10−11 1.30 × 1019 6.26 × 10−5 39
Rk 6/Rl 2 1CH2 + C3H7 → C2H4 + C2H5 1.82 4.29 × 10−11 4.26 × 1014 1.99 × 10−9 38
Rk 7/Rd 11 3CH2 + C2H5 → C2H4 + CH3 1.22 3.00 × 10−11 5.99 × 1020 2.79 × 10−3 37
Rk 8/Rl 3 3CH2 + C3H7 → C2H4 + C2H5 1.62 3.00 × 10−12 3.48 × 1014 1.62 × 10−9 38
Rk 9/Re 3 CH3 + C2H5 → C2H4 + CH4 1.10 6.87 × 10−12 2.27 × 1021 0.011 15, 26
Rk 10/Rg 9 C2H + C2H5 → C2H4 + C2H2 2.03 3.00 × 10−12 2.09 × 1018 9.74 × 10−6 37
Rk 11/Rg 16 C2H3 + C2H3 → C2H4 + C2H2 1.60 3.50 × 10−11 1.27 × 1017 5.91 × 10−7 66
Rk 12 C2H3 + C2H5 → 2 C2H4 1.64 1.50 × 10−11 2.40 × 1017 2.10 × 10−5 66
Rk 13 C2H3 + C3H5 → C2H4 + CH2CCH2 1.39 4.00 × 10−12 8.05 × 1016 3.76 × 10−7 39
Rk 14 C2H3 + C3H7 → C2H4 + C3H6 1.97 2.00 × 10−12 2.31 × 1012 1.08 × 10−11 38
Rk 15 C2H3 + C4H3 → C2H4 + C4H2 2.07 1.75 × 10−12 1.15 × 1015 5.38 × 10−9 27
Rk 16/Rm 4 2 C2H5 → C2H4 + C2H6 1.44 2.40 × 10−12 1.24 × 1019 5.81 × 10−5 33
Rk 17 C2H5 + C3H3 → C2H4 + CH3CCH 1.37 6.68 × 10−12 1.39 × 1018 6.48 × 10−6 37, 44
Rk 18 C2H5 + C3H5 → C2H4 + C3H6 1.36 6.68 × 10−12 5.27 × 1018 2.46 × 10−5 34
Rk 19 C2H5 + C3H7 → C2H4 + C3H8 1.67 5.00 × 10−11 6.37 × 1013 7.82 × 10−9 15, 38
Rk 20 C2H5 + C4H3 → C2H4 + C4H4 2.13 8.00 × 10−13 4.50 × 108 2.10 × 10−15 27
Rk 21/Rc 3 N(4S) + C2H5 → C2H4 + NH 0.67 7.10 × 10−11 1.87 × 1015 8.73 × 10−9 22
Rk 22 C2H + NH3 → C2H4 + NH 0.89 2.09 × 10−9 4.22 × 1019 1.97 × 10−4 43
Rk 23 C2H + CH2NH → C2H4 + CH2NH 1.03 2.57 × 10−9 5.40 × 1020 2.52 × 10−3 61
Rk 24 C2H + CH3CN → C2H4 + CH4CN+ 1.58 3.80 × 10−9 3.64 × 1020 1.70 × 10−3 3
Rk 25 C2H + HC3N → C2H4 + HC3NH+ 0.75 3.55 × 10−9 7.39 × 1018 3.45 × 10−5 3
Rk 26 C2H + C3H3N → C2H4 + C3H3NH+ 1.51 5.80 × 10−9 2.35 × 1019 1.10 × 10−4 15
Rk 27 C2H + C3H5N → C2H4 + C3H5NH+ 1.10 6.00 × 10−9 2.10 × 1016 9.81 × 10−8 15
Rk 28/Rb 9 C3H + e → C2H4 + 3CH2 1.82 3.81 × 1015 1.78 × 10−8 18
Rk 29/Rd 34 C3H + e → C2H4 + CH3 2.90 1.56 × 1020 7.27 × 10−4 12

C2H5

Rl 1 H + C2H4 + M → C2H5 + M 0.77 k0 = 1.64 × 10−28 2.85 × 1016 1.33 × 10−7 34, 77
k = 4.85 × 10−14
kR = 5.62 × 10−17
Fc = 0.20
Rl 2/Rk 6 1CH2 + C3H7 → C2H5 + C2H4 1.76 4.29 × 10−11 2.40 × 1014 1.12 × 10−9 38
Rl 3/Rk 8 3CH2 + C3H7 → C2H5 + C2H4 1.56 3.00 × 10−12 2.00 × 1014 9.33 × 10−10 38
Rl 4/Rg 11 C2H + C2H6 → C2H2 + C2H5 0.65 4.15 × 10−11 1.68 × 1019 1.51 × 10−6 52
Rl 5 C2H + C3H7 → C2H5 + C3H3 1.22 2.00 × 10−11 2.00 × 1013 9.32 × 10−11 38
Rl 6 C3H + e → C2H5 + CH 0.91 3.34 × 1018 1.56 × 10−5 18
Rl 7/Rd 35 C3H + e → C2H5 + CH3 2.75 1.58 × 1019 7.38 × 10−5 18

C2H6

Rm 1 H + C2H5 + M → C2H6 + M 2.09 k0 = 2.38 × 10−30 4.57 × 109 2.13 × 10−14 62, 63
k = 1.66 × 10−10
Rm 2 2 CH3 + M → C2H6 + M 1.85 k0 = 2.04 × 10−25 6.18 × 1021 0.029 15
k = 7.45 × 10−11
kR = 1.65 × 10−13
Fc = 0.37
Rm 3/Rg 17 C2H3 + C2H5 → C2H6 + C2H2 1.53 8.00 × 10−13 6.76 × 1016 3.16 × 10−7 37
Rm 4/Rk 16 2 C2H5 → C2H6 + C2H4 1.34 2.40 × 10−12 7.08 × 1018 3.30 × 10−5 33
Rm 5 C2H5 + C3H7 → C2H6 + C3H6 1.72 5.00 × 10−11 4.51 × 1013 2.10 × 10−10 15, 38
Rm 6 C2H5 + C4H3 → C2H6 + C4H2 1.74 8.00 × 10−13 7.07 × 1015 3.30 × 10−8 27
Rm 7 C2H + C3H8 → C2H6 + C3H 0.82 5.00 × 10−11 3.02 × 1015 1.41 × 10−8 26
Rm 8 C3H + e → C2H6 + CH 1.17 2.25 × 1020 1.05 × 10−3 20
Rm 9/Rb 10 C3H + e → C2H6 + 3CH2 2.55 6.65 × 1018 3.10 × 10−5 15
Rm 10/Rd 36 C3H + e → C2H6 + CH3 2.67 8.19 × 1018 3.82 × 10−5 15
Rm 11/Ri 7 C4H + e → C2H6 + C2H3 3.32 2.20 × 1018 1.03 × 10−5 18, 48

Notes. ΔE is the kinetic energy release, k is the reaction coefficient, Te is the electron temperature, Φesc is the escape rate of a neutral species via a certain chemical channel, is the corresponding fractional contribution to total C or total N escape. When not stated explicitly, all rate coefficients refer to a neutral temperature of 150 K. For three-body reactions, several parameters are provided, which could be used to obtain the appropriate rate coefficients with the aid of Eqs. (1) and (2) in Sect. 2.

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