Table 6
UV photoprocessing experiments of H2O:CH4 ice analogs.
| Experiment | Ninitial(H2O) | Ninitial(CH4) | Fluence | Nfinal(H2O) | Nfinal(CH4) | Nfinal(CH3OH) | Nfinal(H2CO)a |
| ×1015 molecules cm-2 | ×1017 photons cm-2 | ×1015 molecules cm-2 | |||||
|
|
|||||||
| 3 | 426.7 | 119.2 | 7.2 | 376.0 | 62.0 | 7.2 | ... |
| 4 | 586.2 | 229.6 | 7.8 | 520.9 | 173.8 | 7.8 | ... |
| 5 | 898.2 | 216.3 | 10.8 | 878.2 | 153.7 | 4.9 | ... |
| 6 | 560.1 | 161.3 | 7.2 | 500.1 | 101.2 | 4.2 | ... |
|
|
|||||||
| 7b | 506.6 | 150.6 | 7.2 | 462.4 | 89.0 | 0.0 | ... |
| 8b | 721.9 | 263.0 | 10.8 | 665.4 | 165.3 | 0.4 | ... |
| 9b | 372.9 | 160.2 | 7.2 | 335.0 | 90.6 | 1.8 | ... |
| 10b | 523.7 | 146.8 | 6.0 | ...c | ...c | ...c | ...c |
Notes.
Formaldehyde was barely detected by means of IR spectroscopy, and no quantification was possible. Formation of H2CO was confirmed during the TPD.
No IR spectrum was collected at the end of this experiment, since it focused only on measuring QMS signals during irradiation (see Fig. 10).
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