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Home All issues Volume 592 (August 2016) A&A, 592 (2016) A99 Full HTML
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Table 1

Deposited molecules.

Sample Conc.a Thicknessb Moleculec N d Beam Energy See Fluence Dosef
N2:CH4 [μm] [cm-2] [MeV] [keV μm-1] [ions cm-2] [eV molecule-1]
a 90:10 8.4 ± 0.4 CH4 1.7 × 1018 58Ni11+ 44 3794 1.0 × 1013 18
H2O 1.6 × 1016
b 90:10 9.9 ± 0.5 CH4 1.5 × 1018 58Ni11+ 44 3794 3.0 × 1013 54
H2O 1.6 × 1016
c 98:2 10.0 ± 0.6 CH4 2.6 × 1017 40Ar15+ 160 1617 3.4 × 1012 3
H2O 8.3 × 1015
d 98:2 20 ± 2 CH4 6.3 × 1017 40Ar15+ 160 1617 2.2 × 1013 18
H2O 4.4 × 1016

Notes.

(a)

Concentration given by Air Liquide.

(b)

The thickness is estimated from the interference fringes period via the formula e ≈ 1/2nΔν, where e is the thickness, n the refractive index of the ice film, and Δν the period of interference fringes.

(c)

Taking into account the water pollution.

(d)

The calculated water contamination is about 1−7% with respect to CH4.

(e)

Calculated with SRIM (Ziegler et al. 2010), assuming an ice density of 0.94 g cm-3 (Satorre et al. 2008).

(f)

D = F × Se/ρ, where F is the ion fluence, Se its electronic stopping power, and ρ the target density.

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