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Table 1
Initial abundances of selected species with respect to hydrogen nuclei.
| Species | MC1 | MC2 | MC3 | AT1 | AT2 | AT4 |
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| o - H2 | 2.4(−2) | 1.1(−3) | 2.4(−4) | 4.5(−2) | 5.0(−3) | 5.0(−5) |
| p - H2 | 4.8(−1) | 5.0(−1) | 5.0(−1) | 4.5(−1) | 5.0(−1) | 5.0(−1) |
| HD | 1.4(−5) | 1.4(−5) | 1.1(−5) | 1.5(−5) | 1.5(−5) | 1.5(−5) |
| H i | 5.2(−4) | 7.3(−5) | 5.1(−5) | − | − | − |
| D i | 7.6(−7) | 9.5(−7) | 2.3(−6) | − | − | − |
| H2O | 6.9(−9) | 5.2(−9) | 9.2(−9) | − | − | − |
| HDO | 1.2(−12) | 3.7(−11) | 1.3(−9) | − | − | − |
| D2O | − − | 2.9(−13) | 8.1(−11) | − | − | − |
| iH2O | 8.4(−5) | 1.1(−4) | 1.2(−4) | − | − | − |
| iHDO | 1.1(−8) | 1.3(−8) | 3.4(−8) | − | − | − |
| iD2O | 6.9(−13) | 7.1(−13) | 1.8(−11) | − | − | − |
| O i | 2.2(−5) | 1.7(−6) | 2.3(−7) | 1.8(−4) | 1.8(−4) | 1.8(−4) |
| O2 | 1.9(−9) | 4.0(−10) | 3.2(−10) | − | − | − |
| iO2 | − | − | − | − | − | − |
| CO | 6.1(−5) | 3.6(−5) | 5.1(−6) | − | − | − |
| iCO | 1.2(−5) | 3.1(−5) | 4.7(−5) | − | − | − |
Notes. a(−b) means a × 10− b. o - H2 indicates ortho-H2, while p - H2 indicates para-H2. iX indicates species X in the bulk ice mantle. − indicates that abundances are less than 10-13.
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