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Table 2.

Initial chemical abundances.

Species Abundance Species Abundance
n(X) / n(H) n(X) / n(H)
ortho-H2 0.375 CH4 ice 1.8 × 10−5
para-H2 0.125 CO ice 6.0 × 10−5
HD 1.55 × 10−5 CH3OH ice 4.5 × 10−5
H 5.0 × 10−7 CO2 ice 6.0 × 10−5
He 0.098 CH4 ice 1.8 × 10−5
Cl 1.0 × 10−9 H2O ice 3.0 × 10−4
Si 8.0 × 10−9 H2S ice 6.6 × 10−6
Fe 3.0 × 10−9 N2 ice 2.1 × 10−5
Mg 7.0 × 10−9 NH3 ice 2.1 × 10−5
Na 2.0 × 10−9 P 2.0 × 10−10

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