Table 2
Overview of the various models investigated in this work.
| Model | ERa | PDIb | 3Bc | 3BEFd | No. rounds | RD efficiency | H2 removal | Other modifications |
|---|---|---|---|---|---|---|---|---|
| I1★ | ✗ | ✗ | ✗ | ✗ | ✗ | Exp. based | ✗ | |
| I2★ | ✗ | ✗ | ✗ | ✗ | ✗ | Exp. based | ✗ | Tunnel diffusion |
| I3★ | ✗ | ✗ | ✗ | ✗ | ✗ | Exp. based | ✗ | Fast diffusion |
| I4★ | ✗ | ✗ | ✗ | ✗ | ✗ | Exp. based | Scaled Eb | |
| I5★ | ✗ | ✗ | ✗ | ✗ | ✗ | Exp. based | Scaled Eb | Tunnel diffusion |
| I6★ | ✗ | ✗ | ✗ | ✗ | ✗ | Exp. based | Scaled Eb | Fast diffusion |
| D1★ | ✗ | ✗ | ✗ | ✗ | ✗ | 1% | Scaled Eb | |
| D2★ | ✗ | ✗ | ✗ | ✗ | ✗ | 1% | Scaled Eb | Tunnel diffusion |
| D3★ | ✗ | ✗ | ✗ | ✗ | ✗ | 1% | Scaled Eb | Fast diffusion |
| ND1★ | ✓ | ✗ | ✗ | ✗ | ✗ | 1% | Scaled Eb | |
| ND2★ | ✗ | ✓ | ✗ | ✗ | ✗ | 1% | Scaled Eb | |
| ND3★ | ✗ | ✗ | ✓ | ✗ | 1 | 1% | Scaled Eb | |
| ND4★ | ✗ | ✗ | ✓ | ✗ | 2 | 1% | Scaled Eb | |
| ND5★ | ✗ | ✗ | ✓ | ✓ | 1 | 1% | Scaled Eb | |
| ND6★ | ✓ | ✓ | ✓ | ✗ | 1 | 1% | Scaled Eb | |
| D4† | ✗ | ✗ | ✗ | ✗ | ✗ | 1% | Scaled Eb | |
| ND7† | ✓ | ✗ | ✗ | ✗ | ✗ | 1% | Scaled Eb | |
| ND8† | ✗ | ✓ | ✗ | ✗ | ✗ | 1% | Scaled Eb | |
| ND9† | ✗ | ✗ | ✓ | ✗ | 1 | 1% | Scaled Eb | |
| ND10† | ✗ | ✗ | ✓ | ✗ | 2 | 1% | Scaled Eb | |
| ND11† | ✗ | ✗ | ✓ | ✓ | 1 | 1% | Scaled Eb | |
| ND12† | ✓ | ✓ | ✓ | ✗ | 1 | 1% | Scaled Eb | |
| NM1† | ✗ | ✗ | ✗ | ✗ | ✗ | 1% | Scaled Eb | Include CH3O+H2CO |
| NM2† | ✗ | ✗ | ✓ | ✗ | 1 | 1% | Scaled Eb | Include CH3O+H2CO |
| BE1† | ✗ | ✗ | ✗ | ✗ | ✗ | 1% | Eb(H2) = 640/500e K | |
| BE2† | ✗ | ✗ | ✗ | ✗ | ✗ | 1% | Dynamic Eb all species | |
| BE3† | ✗ | ✗ | ✗ | ✗ | ✗ | 1% | Dynamic Eb only H2 | |
| BE4† | ✗ | ✗ | ✗ | ✗ | ✗ | 1% | Dynamic Eb only H & H2 | |
| D5† | ✗ | ✗ | ✗ | ✗ | ✗ | 1% | Scaled Eb | H-abstraction reac. |
| D6† | ✗ | ✗ | ✗ | ✗ | ✗ | Exp. based | Scaled Eb | |
| D7† | ✗ | ✗ | ✗ | ✗ | ✗ | Exp. based | Scaled Eb | H-abstraction reac. |
| D8† | ✗ | ✗ | ✗ | ✗ | ✗ | 1% | Scaled Eb | Ini.abund: 50%H/50%H2 |
Notes. Only the chemical and physical properties that vary between models are listed.★ Models that apply the single collision model proposed by Hasegawa et al. (1992) to derive the reaction probabilities.† Models that apply the RDC model proposed by Chang et al. (2007) to derive the reaction probabilities. (a)Eley-Rideal reactions, (b)photodissociation-induced reactions, (c) three-body reactions and (d)three-body reactions with excited formation. IX are models with intermediate modifications steps presented in Appendices A and B, DX are models with solely diffusive reaction mechanisms, NDX are models with additional non-diffusive reaction mechanisms, NMX are models for which the chemical network was modified, and BEX are models with modified H2 removal methods. (e) 640 K being the binding energy on bare grain surfaces, 500 K being the binding energy on water ice.
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