Table 1
Table of experiments parameters.
| Sample (a) | Thickness (b) | Beam | Energy | Flux (c) | Fluence | Dose (d) |
|---|---|---|---|---|---|---|
| (μm) | (MeV) | (×108 ions cm−2 s−1) | (×1012 ions cm−2) | (eV molecule−1) | ||
| N2 -CH4 (90:10) | 15.2 ± 0.4 | 129 Xe13+ | 92 | 4 | 8 | 19 |
| N2 -CH4 (90:10) + CD4 | 18.9 ± 0.5 | 129 Xe13+ | 88 | 5 | 10 | 19 |
Notes. (a) Concentration given by Air Liquide. CD4 was pure. (b)The thickness is estimated from the interference fringes period via the formula e ≈ 1/2 nΔν, e is the thickness, n the refractive index of the ice film, and Δν the period of interference fringes. The CD4 layer has a thickness lower than 1 μm, see Fig. 2. (c) Mean flux during the irradiation. Flux values range from 108 cm−2 s−1 to 109 ions cm−2 s−1. The lowest (highest) values are used at the beginning (end) of the experiment to reach lowest (highest) fluence steps. (d) D = F × Se∕ρ, where F is the ion fluence, Se its mean electronic stopping power along the target thickness, and ρ the target density. The value Se was calculated with SRIM (Ziegler et al. 2010), assuming an ice density of 0.94 g cm−3 (Satorre et al. 2008).
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