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Table 2

Key reactions responsible for the uncertainties on major C3Hp compounds at an altitude of 1300, 1000, 600, and 200 km.

Carbon trimer C3
Reaction RCCs
at 1300 km at 1000 km at 600 km at 200 km
H + CH → C + H2 0.21 0.24 0.24
C2H + C3 → C5 + H −0.24
N(2D) + C3 → CN + C2 −0.64 −0.52
N(2D) + HCN → CH + N2 0.37 0.35
H + C2N → HCN + C 0.20
H + C2H2 + M → C2H3 + M 0.74
H + C3 → l-C3H −0.48 −0.40
H + c-C3H2 → C3H3 −0.25 −0.28
H + l-C3H → C3 + H2 0.25
H + l-C3H → c-C3H + H 0.25
Cyclopropenylidene c-C3H2
Reaction RCCs
at 1300 km at 1000 km at 600 km at 200 km
CH + CH4 → C2H4 + H −0.24 −0.25
CH + C2H2 → t-C3H2 + H 0.23 0.33
N(4S) + C3H3 → H2C3N + H −0.22
N(4S) + CN2 → CN + N2 −0.25
N(2D) + HCN → CH + N2 0.53 0.48
H + C2H2 + M → C2H3 + M 0.79
H + c-C3H2 → C3H3 −0.88 −0.45
Propargyl radical C3H3
Reaction RCCs
at 1300 km at 1000 km at 600 km at 200 km
H + CH → C + H2 0.37 0.20
N(4S) + C3H3 → H2C3N + H −0.40 −0.45
C2N + H → HCN + C 0.34 0.28
C2N + C2H4→ C3H3CN + H −0.25 −0.21
H + C2H2 + M → C2H3 + M 0.82
H + c-C3H2 → C3H3 0.30
H + C3H3 → CH3C2H −0.69 −0.30
H + CH2CCH2 → C3H5 −0.22
CH3 + C3H3 → C2H4 + C2H2 −0.25
Allene CH2CCH2
Reaction RCCs
at 1300 km at 1000 km at 600 km at 200 km
H + C3H5 → CH2CCH2 + H2 0.20 0.35
CH + CH4 → C2H4 + H −0.23 −0.23
CH + C2H4 → CH2CCH2 + H 0.68 0.72 0.24
N(2D) + HCN → CH + N2 0.51 0.41
H + C2H2 + M → C2H3 + M 0.72
H + C3H3 → CH2CCH2 0.31
H + CH2CCH2 → C3H5 −0.63 −0.22
H + C3H5 → C3H6 −0.30

Notes. Only the reactions with absolute values of RCCs greater than 0.2 are displayed. A blank value means that the RCC value is lower than 0.2 and is not given for clarity.

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