Table 2
CO desorption time constants, τ, and photodesorption cross-sections for the slow desorption process, σ2.
| Ice | Eirr (mJ) | ϕ (photons cm−2 s−1) | τ1 (s) | τ2 (s) | σ2 (cm2) |
|---|---|---|---|---|---|
| CO:PHP mixed | 40 | 4.5 × 1020 | 0.25 ± 0.04 | 4.4 ± 1.3 | (0.5 ± 0.2) × 10−21 |
| CO/PHP layered | 61 | 6.9 × 1020 | 0.001a | 1.0 ± 0.1 | (1.5 ± 0.1) × 10−21 |
Notes. Values are obtained from the bi-exponential fits in Fig. 3 for irradiation at 3.42 µm, corresponding to the PHP band. The associated irradiation energies, Eirr, and photon fluxes, ϕ, are also listed. Error limits represent one standard deviation on the fitted value. (a) The fit is insensitive to this time constant due to its small value and its uncertainty is therefore not reported.
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