Table 7
Column density of the different ice species corresponding to an absorbed photon flux of 95% and 99%.
| 95% photon absorption | 99% photon absorption | |||||
| Species | Ly-α | Avg. | Max. | Ly-α | Avg. | Max. |
| (×1017 molec./cm2) | (×1017 molec/cm2) | |||||
|
|
||||||
| CH4 | 2.1 | 5.3 | 1.8 | 3.3 | 8.1 | 2.7 |
| CO2 | 29.3 | 44.5 | 15.1 | 45.1 | 68.4 | 23.3 |
| N2 | 29957 | 4280 | 881 | 46052 | 6579 | 1354 |
| O2 | 21.4 | 6.2 | 3.7 | 32.9 | 9.6 | 5.6 |
Notes. Ly-α corresponds to the cross section at the Ly-α wavelength, 121.6 nm; in the case of N2, the upper limit in the cross section leads to a lower limit in the absorbing column density. Avg. corresponds to the average cross section in the 120−160 nm range. Max. corresponds to the maximum cross section in the same wavelength range.
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