Table 1
Irradiations parameters and deduced a-C:H destruction cross sections.
| Ion | Fluence | Sea | Projected | a-C:H | |||||
| Ion | energy | Max | (MeV mg-1 cm-2) | range | Thickness | T | σ b | NCH(a-C:H)c | |
| (MeV) | (cm-2) | [eV /Å] | (μm) | (μm) | (K) | (103 Å2) | (1019 cm-2) | f d | |
|
|
|||||||||
| 197Au25 + | 945.4 | 8 × 1011 | 126 | 74.7 | 0.63 ± 0.16 | 300 | 9.15 ± 1.3 | 0.35 ± 0.09 | 0.53 |
| [1500] | |||||||||
|
|
|||||||||
| 5 × 1012 | 2.2 ± 0.5 | 300 | 3.12 ± 0.1 | 1.23 ± 0.30 | 0.79 | ||||
| 132Xe21 + | 633.1 | 2 × 1012 | 92 | 64.5 | 3.3 ± 0.8 | 100 | 3.35 ± 0.3 | 1.82 ± 0.45 | 0.48 |
| 2 × 1012 | [1100] | 3.7 ± 0.9 | 40 | 2.94 ± 0.2 | 2.07 ± 0.52 | 0.44 | |||
|
|
|||||||||
| 2 × 1014 | 7.3 ± 1.7 | 300 | 0.0245 ± 0.004 | 4.04 ± 0.97 | 0.37 | ||||
|
43.2 | 2 × 1014 | 3.6 | 66.4 | 5.7 ± 1.4 | 25 | 0.0323 ± 0.011 | 3.16 ± 0.79 | 0.44 |
| 1 × 1014 | [44] | 4.7 ± 1.2 | 25 | 0.0321 ± 0.019 | 2.62 ± 0.65 | 0.27 | |||
Notes.
Electronic stopping power, calculated using the SRIM-2013 code (Ziegler et al. 2010), with an H/C of 1 and a density of 1.2g/cm3 (as in Godard et al. 2011).
CH bonds destruction cross section determined by fitting an exponential function ∝exp(−σ × fluence) to the CH column density evolution with fluence shown in the insets of Figs. 1 and 4.
Column density of CH bonds locked in the CH2 and CH3 group of the a-C:H film. See Sect. 3.1 for details.
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