Table 2.
CH4 diffusion coefficients on ASW grown at 30 K (M1–M12 and A1–A10) or at 50 K (AA1–AA5), obtained with two different approximations, Fick’s second law or Fick’s first law, as indicated.
| Experiment | Tiso | LASW/LCH4 | D(2nd Fick) | D(1st Fick) |
|---|---|---|---|---|
| (K) | (nm nm) | (10−13 cm2 s−1) | (10−13 cm2 s−1) | |
| M1 | 50 | 146/19 | 1.7 | 1.0 |
| M2 | 50 | 228/17 | 2.7 | 1.3 |
| M3 | 50 | 275/36 | 3.7 | 1.6 |
| M4 | 50 | 344/16 | 2.5 | 2.1 |
| M5 | 50 | 410/40 | 8.1 | 4.0 |
| M6 | 50 | 453/47 | 10.3 | 4.0 |
| M7 | 50 | 185 | 1.4 | 0.9 |
| M8 | 50 | 201 | 1.8 | 0.6 |
| M9 | 50 | 212 | 1.8 | 0.8 |
| M10 | 55 | 567 | 26.9 | |
| M11 | 55 | 487/37 | 15.4 | |
| M12 | 60 | 469 | 44.9 | |
| A1 | 50 | 333 | 9 | |
| A2 | 50 | 333 | 1.2 | |
| A3 | 50 | 476 | 6.96 | |
| A4 | 50 | 520 | 6 | |
| A5 | 50 | 827 | 30 | |
| A6 | 50 | 913 | 39 | |
| A7 | 50 | 1026 | 57 | |
| A8 | 50 | 1033 | 42 | |
| A9 | 50 | 223/169 | 1.56 | |
| A10 | 50 | 378/33 | 5.38 | |
| LCH4/LASW | ||||
| AA1 | 42.5 | 335/951 | 0.226 | |
| AA2 | 45 | 355/946 | 1.03 | |
| AA3 | 47.5 | 353/930 | 0.929 | |
| AA4 | 50 | 358/945 | 3.62 | |
| AA5 | 52.5 | 356/953 | 4.23 | |
Notes. When only one thickness appears in column three, it corresponds to the ASW ice thickness in co-deposited ices, estimated as if no CH4 were present.
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