Table 5
Evolution of the photon-induced desorption yields during UV irradiation of a pure C2H5OH ice.
| Irradiation period | Fluencea | Ypd (H2CO)b,c | Ypd (C2H6)b,c | Ypd (H2O)b,c | Ypd (CH4)b | Ypd (CO)b |
| (min) | (photons cm-2) | 10-5 ( ) |
10-4 () |
10-3 () |
||
|
|
||||||
| 0−1 | 1.2 × 1016 | ≤7.6 | ≤1.3 | ≤1.1 | 1.8 | 0.6 |
| 1−6 | 7.2 × 1016 | ≤5.9 | ≤1.0 | ≤2.0 | 2.3 | 0.7 |
| 6−15 | 1.8 × 1017 | ≤5.5 | ≤1.0 | ≤2.7 | 3.1 | 1.0 |
| 15−31 | 3.7 × 1017 | ≤6.4 | ≤1.1 | ≤2.4 | 3.4 | 1.1 |
| 31−60 | 7.2 × 1017 | ≤5.8 | ≤1.0 | ≤2.7 | 3.2 | 1.5 |
Notes.
averaged for each irradiation period in experiment 2. Results were similar in experiment 1. Photon-induced desorption yield values could be different by a factor 2 due to the uncertainties in all the parameters of Eq. (2);
we consider these values upper limits due to possible contribution from other species to the signal of the selected mass fragment and/or from the small rise experienced by the ion currents when the UV lamp is switched on (see Sect. 2).
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