Table 1
Ice samples used in the processing experiments.
| List of experiments | |||||
|---|---|---|---|---|---|
| Sample | T (K) | Nind molecules cm−2 1016 | Nwmolecules cm−2 1017 | ρ g cm−3 | h each face nm |
| VUV1: indene, amorphous | 10 | 3.2 | 1.3 | 24 | |
| VUV2: indene, crystaline | 130 | 3.0 | 1.4 | 20 | |
| VUV3: indene (3%)/water | 10 | 2.4 | 8.2 | 0.67 | 210 |
| VUV4: indene (l%)/water | 10 | 1.1 | 12 | 0.66 | 290 |
| ELE1: indene, amorphous | 10 | 1.3 | 1.3 | 95 | |
| ELE2: indene, amorphous | 10 | 8.6 | 1.3 | 62 | |
| ELE3: indene, crystalline | 130 | 2.1 | 1.4 | 15 | |
| ELE4: indene (1.5%)/water | 10 | 2.6 | 17 | 0.66 | 400 |
Notes. Nind and Nw correspond to the column densities of indene and water respectively, ρ is the volume density of the ice and h is the estimated sample thickness. The densities of the pure indene ices are taken from DFT simulations (see Maté et al. 2023) and that of amorphous water is assumed to be ρw ≈ 0.65 g cm−3 (Dohnálek et al. 2003). The density of the mixtures has been approximated as ρ ≈ f1 ρ1 + f2ρ2, where fi is the molecular fraction of component i.The samples labeled “VUV” correspond to photon irradiation with the D2 lamp (see text) and those labeled “ELE” to bombardment with 5 keV electrons. Estimated uncertainties are ≈30% for Nind, ≈20% for Nw, and ≈30–40% for h.
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