Table 6
Penetration depth, expressed as absorbing column density, of the different pure ice species deposited at 8 K, 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 molecule cm-2) | (×1017 molecule cm-2) | |||||
|
|
||||||
| CO | ≥150 | 6.4 | 1.9 | ≥230 | 9.8 | 2.9 |
| H2O | 5.8 | 8.3 | 4.9 | 8.9 | 13.0 | 7.7 |
| CH3OH | 3.5 | 5.7 | 3.4 | 5.4 | 8.7 | 5.3 |
| NH3 | 3.3 | 5.5 | 3.2 | 5.1 | 8.5 | 5.0 |
| H2S | 0.73 | 0.81 | 0.73 | 1.1 | 1.2 | 1.1 |
Notes. Ly-α corresponds to the cross section at the Ly-α wavelength, 121.6 nm; in the case of CO, the upper limit in the cross section leads to a lower limit in the absorbing column density. Avg. corresponds to the average value of the cross section in the 120–160 nm range. Max. corresponds to the maximum value of the cross section in the same wavelength range. Errors in the penetration depth correspond to those estimated for the VUV-absorption cross sections of the different ices.
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