Table 5
Evolution of the CO and O2 photodesorption yields during UV irradiation of a pure CO2 ice analog.
| Irradiation time | Fluence | Ypd (CO)a | Ypd (O2)a |
| (min) | (photons cm-2) | 10-2 ( ) |
10-4 () |
|
|
|||
| 5 | 6.0 × 1016 | 0.3 | 1.7 |
| 30 | 3.6 × 1017 | 0.8 | 6.7 |
| 60 | 7.2 × 1017 | 1.1 | 9.2 |
| 120 | 1.4 × 1018 | 1.3 | 10.0 |
| 240 | 2.9 × 1018 | 1.2 | 8.9 |
Notes.
Averaged for each irradiation period. We assume uncertainties of about 30−40%, mostly due to the uncertainty in the ionization cross sections (15% according to Majeed & Strickland 1997) and in the measurement of the UV flux.
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