Table 3
Results for gaseous and solid ethylene oxide fractional abundances at 1.2×106 years in different one-temperature chemical models.
| nH/cm-3 | T/K | N-td | f(c-C2H4O) | f(mc-C2H4O) | |
|
|
|||||
| M1 | 1 × 104 | 10 | ON | 5.7 × 10-14 | 6.8 × 10-18 |
| M2 | 1 × 104 | 15 | ON | 3.7 × 10-14 | 5.5 × 10-18 |
| M3 | 1 × 104 | 20 | ON | 6.3 × 10-15 | 1.1 × 10-18 |
| M4 | 1 × 104 | 20 | OFF | 1.9 × 10-17 | 1.1 × 10-12 |
| M5 | 1 × 104 | 50 | ON | 4.6 × 10-15 | 1.2 × 10-18 |
| M6 | 1 × 104 | 50 | OFF | 2.0 × 10-21 | 6.4 × 10-25 |
| M7 | 1 × 107 | 200 | ON | 3.3 × 10-16 | 2.1 × 10-32 |
| M8 | 1 × 107 | 200 | OFF | 3.3 × 10-16 | 2.1 × 10-32 |
| M9 | 1 × 108 | 300 | ON | 4.3 × 10-18 | 5.8 × 10-35 |
| M10 | 1 × 108 | 300 | OFF | 4.3 × 10-18 | 5.8 × 10-35 |
Notes.Starting from the left, the first column represents the gas density; T is the temperature of the source; the third column shows whether the model accounts (ON) or not (OFF) for the effects due to non-thermal desorption; f(c-C2H4O) and f(mc-C2H4O) are the fractional abundances of ethylene oxide relative to hydrogen nuclei in the gas-phase and on the grain surface, respectively. The m before the molecular formula stands for mantle.
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