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Table 2

Rate constants kaeb (in s−1) and efficiency ε of the two possible reactions between HCO and CH3.

Rate Temperature α β γ 9 K 20 K 30 K
Ediff∕Edes constant (K) (s−1) (K)
Reaction (1): HCO + CH3 → CH3CHO
kaeb 2.7 × 10−21 1.9 × 10−3 160.5
9–30 3.1 × 1012 0.70 663
0.5 ε 1.0 1.0 1.0
9–19 1.0 0.0 0.0
19–26 0.99 –3.4 × 10−3 0.06
26–30 0.98 –0.01 0.28
0.4 ε 0.88 0.81 0.81
9–13 0.43 –0.21 0.28
13–30 1.0 0.14 −3.4
0.3 ε 4.9 × 10−8 7.6 × 10−3 0.01
9–30 3.3 0.12 161.2
Reaction (2): HCO + CH3 → CH4 + CO
kaeb 6.8 × 10−5 0.05 20.1
9–15 6.1 × 109 10.4 –39.7
15–30 1.7 × 1023 25.9 –274
ε 1.0 1.0 1.0
0.5 9–24 1.0 0.0 0.0
24–28 0.83 –0.12 2.79
28–30 0.53 –0.44 11.4
0.4 ε 1.0 1.0 0.35
9–21 1.0 0.0 0.0
21–25 7.4 × 10−11 –13.8 278.8
25–30 3.2 × 10−6 –5.8 53.3
0.3 ε 1.0 0.02 1.5 × 10−3
9–15 0.96 –0.01 0.02
15–19 2.4 × 10−76 –84.9 1205.1
19–30 2.4 × 107 19.9 –660.4

Notes. For each reaction, we report the values of α, β and γ of the rate constant kaeb and the efficiency ε calculated assuming Ediff /Edes equal to 0.5, 0.4 and 0.3 (first column). The last three columns report the values of kaeb and ε at 9, 20 and 30 K.

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