Table A.4
Reactions on grain surfaces.
| Reactiona | δ bare b | δ ice b | ϵ c |
|
|
|||
| J(H) + J(H) → H2 | 0.900 | 0.0900 | 0 |
| J(H) + J(O) → OH | 0.390 | 0.0390 | 0 |
| J(H) + J(OH) → H2O | 0.270 | 0.0270 | 0 |
| J(H) + J(O3) → OH + O2 | 0.080 | 0.0080 | 480 |
| J(H) + J(H2O2) → H2O + OH | 0.021 | 0.0021 | 1000 |
| J(H) + J(CO) → HCO | 0.007 | 0.0007 | 5000 |
| J(H) + J(HCO) → H2CO | 0.070 | 0.0070 | 0 |
| J(H) + J(HCO) → CO + H2 | 0.470 | 0.0470 | 0 |
| J(H) + J(H3CO) → CH3OH | 0.023 | 0.0023 | 0 |
| J(O) + J(O) → O2 | 0.680 | 0.0680 | 0 |
| J(N) + J(N) → N2 | 0.890 | 0.0890 | 0 |
|
|
|||
| J(H) + J(H) → J(H2) | 0.100 | 0.9100 | 0 |
| J(H) + J(O) → J(OH) | 0.610 | 0.9610 | 0 |
| J(H) + J(OH) → J(H2O) | 0.730 | 0.9730 | 0 |
| J(H) + J(O3) → J(OH) + J(O2) | 0.920 | 0.9920 | 480 |
| J(H) + J(H2O2) → J(H2O) + J(OH) | 0.979 | 0.9979 | 1000 |
| J(H) + J(CO) → J(HCO) | 0.993 | 0.9993 | 5000 |
| J(H) + J(HCO) → J(H2CO) | 0.930 | 0.9930 | 0 |
| J(H) + J(H3CO) → J(CH3OH) | 0.977 | 0.9977 | 0 |
| J(O) + J(O) → J(O2) | 0.320 | 0.9320 | 0 |
| J(N) + J(N) → J(N2) | 0.110 | 0.9110 | 0 |
| J(H) + J(HCO) → J(CO) + J(H2) | 0.530 | 0.9530 | 130 |
| J(H) + J(H2CO) → J(H3CO) | 1.000 | 1.0000 | 6000 |
| J(H) + J(H2CO) → J(HCO) + J(H2) | 1.000 | 1.0000 | 2200 |
| J(H) + J(H3CO) → J(H2CO) + J(H2) | 1.000 | 1.0000 | 150 |
| J(H) + J(CH3OH) → J(H3CO) + J(H2) | 1.000 | 1.0000 | 3200 |
| J(H) + J(CO2) → J(CO) + J(OH) | 1.000 | 1.0000 | 10000 |
| J(H) + J(O2) → J(HO2) | 1.000 | 1.0000 | 0 |
| J(H) + J(H2O) → J(OH) + J(H2) | 1.000 | 1.0000 | 9600 |
| J(H) + J(HO2) → J(OH) + J(OH) | 1.000 | 1.0000 | 0 |
| J(O) + J(CO) → J(CO2) | 1.000 | 1.0000 | 650 |
| J(O) + J(HCO) → J(CO2) + J(H) | 1.000 | 1.0000 | 0 |
| J(O) + J(H2CO) → J(CO2) + J(H2) | 1.000 | 1.0000 | 335 |
| J(O) + J(O3) → J(O2) + J(O2) | 1.000 | 1.0000 | 2500 |
| J(O) + J(HO2) → J(O2) + J(OH) | 1.000 | 1.0000 | 0 |
| J(O) + J(OH) → J(O2) + J(H) | 1.000 | 1.0000 | 0 |
| J(O) + J(O2) → J(O3) | 1.000 | 1.0000 | 0 |
| J(OH) + J(CO) → J(CO2) + J(H) | 1.000 | 1.0000 | 400 |
| J(OH) + J(HCO) → J(CO2) + J(H2) | 1.000 | 1.0000 | 0 |
| J(OH) + J(OH) → J(H2O2) | 1.000 | 1.0000 | 0 |
| J(OH) + J(H2) → J(H) + J(H2O) | 1.000 | 1.0000 | 2100 |
| J(OH) + J(CH3OH) → J(H3CO) + J(H2O) | 1.000 | 1.0000 | 1000 |
| J(HO2) + J(H2) → J(H) + J(H2O2) | 1.000 | 1.0000 | 5000 |
Notes.
The expression J(i) means ice of the species i. The reactions above the horizontal line produce gas-phase species, while those below the horizontal line produce solid species.
The parameters δbare and δice indicate the probabilities of desorption upon reaction for bare and icy substrates, respectively. For each substrate, the sum of probabilities of two reactions giving the same species (gas-phase species from one reaction and solid species from the other one) is equal to 1.
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