Table 2
Peak gas-phase fractional abundances (with respect to H2) and corresponding model temperatures for a selection of molecules.
| Fast | Medium | Slow | |||||||||||||||
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| Low EA | High EA | Low EA | High EA | Low EA | High EA | ||||||||||||
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| Species | X [ i ] | T | X [ i ] | T | X [ i ] | T | X [ i ] | T | X [ i ] | T | X [ i ] | T | |||||
| (K) | (K) | (K) | (K) | (K) | (K) | ||||||||||||
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| HCN | 5.2(–7) | 400 | 5.2(–7) | 400 | 1.2(–6) | 398 | 1.2(–6) | 398 | 3.9(–6) | 400 | 3.9(–6) | 400 | |||||
| CH3CN | 5.8(–9) | 400 | 5.8(–9) | 400 | 7.4(–9) | 398 | 6.8(–9) | 398 | 3.4(–9) | 400 | 3.3(–9) | 400 | |||||
| C2H3CN | 2.5(–9) | 400 | 1.6(–9) | 400 | 1.7(–8) | 285 | 1.3(–8) | 285 | 7.4(–9) | 167 | 4.7(–9) | 171 | |||||
| C2H5CN | 2.3(–8) | 131 | 1.2(–8) | 131 | 1.1(–7) | 130 | 8.1(–8) | 130 | 3.5(–8) | 129 | 1.8(–8) | 129 | |||||
| n-C3H7CN | 5.6(–10) | 166 | 1.7(–9) | 166 | 1.4(–8) | 160 | 1.4(–8) | 160 | 1.9(–9) | 156 | 1.2(–9) | 156 | |||||
| i-C3H7CN | 1.7(–9) | 164 | 7.6(–10) | 164 | 3.3(–9) | 160 | 2.3(–9) | 160 | 3.4(–9) | 154 | 1.7(–9) | 154 | |||||
| n-C4H9CN | 2.9(–10) | 204 | 1.9(–10) | 204 | 4.6(–9) | 196 | 4.4(–9) | 196 | 2.0(–9) | 190 | 1.2(–9) | 190 | |||||
| i-C4H9CN | 2.4(–10) | 204 | 3.0(–10) | 202 | 2.8(–9) | 196 | 2.6(–9) | 196 | 3.8(–9) | 190 | 2.7(–9) | 190 | |||||
| s-C4H9CN | 1.3(–9) | 204 | 7.9(–10) | 204 | 1.1(–8) | 196 | 1.1(–8) | 196 | 3.7(–9) | 190 | 2.1(–9) | 190 | |||||
| t-C4H9CN | 1.2(–11) | 204 | 5.2(–12) | 204 | 7.1(–11) | 196 | 5.8(–11) | 196 | 2.0(–10) | 190 | 1.0(–10) | 190 | |||||
| C3H6 | 9.7(–9) | 400 | 9.5(–9) | 400 | 7.3(–8) | 398 | 7.3(–8) | 398 | 1.7(–7) | 395 | 1.7(–7) | 395 | |||||
| C3H8 | 2.8(–7) | 143 | 2.8(–7) | 145 | 6.3(–7) | 143 | 6.4(–7) | 143 | 1.8(–6) | 139 | 1.7(–6) | 139 | |||||
| n-C4H10 | 2.3(–8) | 182 | 2.6(–8) | 182 | 1.7(–7) | 182 | 1.7(–7) | 183 | 2.5(–7) | 177 | 2.5(–7) | 177 | |||||
| i-C4H10 | 3.0(–9) | 182 | 3.2(–9) | 184 | 9.2(–9) | 185 | 9.3(–9) | 185 | 9.1(–8) | 177 | 8.9(–8) | 177 | |||||
| n-C5H12 | 1.2(–10) | 226 | 1.4(–10) | 226 | 1.3(–9) | 220 | 1.4(–9) | 220 | 1.2(–8) | 212 | 1.2(–8) | 212 | |||||
| i-C5H12 | 4.0(–9) | 224 | 4.4(–9) | 224 | 4.0(–9) | 218 | 4.1(–9) | 218 | 2.5(–8) | 210 | 2.5(–8) | 210 | |||||
| neo-C5H12 | 3.4(–11) | 224 | 3.7(–11) | 228 | 1.4(–10) | 222 | 1.4(–10) | 222 | 5.9(–9) | 214 | 5.9(–9) | 214 | |||||
| H2O | 3.3(–4) | 396 | 3.3(–4) | 396 | 3.4(–4) | 398 | 3.4(–4) | 398 | 3.6(–4) | 400 | 3.5(–4) | 400 | |||||
| CH3OH | 2.4(–5) | 131 | 2.4(–5) | 131 | 2.1(–5) | 130 | 2.1(–5) | 130 | 1.1(–5) | 129 | 1.1(–5) | 129 | |||||
| CH3OCH3 | 1.2(–7) | 400 | 1.2(–7) | 400 | 2.0(–7) | 362 | 2.0(–7) | 362 | 1.3(–7) | 161 | 1.3(–7) | 161 | |||||
| HCOOCH3 | 3.1(–7) | 130 | 3.1(–7) | 130 | 7.8(–8) | 125 | 7.8(–8) | 125 | 4.1(–10) | 107 | 3.9(–10) | 107 | |||||
Notes. Results are given for each of the three warm-up timescales, using either high or low activation energies associated with CN addition to unsaturated hydrocarbons. X [ i ] = n [ i ] /n[H2]. A(B) = A × 10B.
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