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Table 1
Fractional gas-phase elemental abundances used in this work.
| Element | Abundance |
|---|---|
| H | 1.00 |
| He | 1.00(− 1) |
| C | 1.38(− 4) |
| N | 7.94(− 5) |
| O | 3.02(− 4) |
| Si | 3.00(− 6) |
| S | 1.86(− 5) |
| Fe | 1.50(− 8) |
Notes. We adopt the elemental abundances of Flower & Pineau des Forêts (2003) and put all of the species depleted on grain mantles into the gas phase. Numbers in parentheses denote powers of 10.
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