Table 2
Diffusion timescales and desorption rates.
| Molecule | D0 (cm2 s−1) | Ea (K) | t100 ML diffusion (yr) | ||||
|---|---|---|---|---|---|---|---|
| 10 K | 20 K | 30 K | 40 K | 50 K | |||
| CO | 2.0 × 10−9 | 960 | 5.3 × 1031 | 7.6 × 1010 | 8.6 × 103 | 2.9 | 2.4 × 10−2 |
| CH3OH | 2.4 × 107 | 7650 | ∞ | 1.2 × 10140 | 5.0 × 1084 | 1.0 × 1057 | 2.5 × 1040 |
| Molecule | ν (s−1) | Edes (K) | kdes (molecule cm−2 s−1) | ||||
| 10 K | 20 K | 30 K | 40 K | 50 K | |||
| CO | 9.1 × 1014 | 1390 | 1.1 × 10−31 | 6.0 × 10−1 | 6.9 × 109 | 7.4 × 1014 | 7.7 × 1017 |
| CH3OH | 3.2 × 1017 | 6620 | 1.1 × 10−255 | 5.7 × 10−112 | 4.7 × 10−64 | 4.3 × 10−40 | 1.0 × 10−25 |
Notes. Diffusion parameters for CO are adopted from Ghesquiere et al. (2015), while those of CH3OH are taken from Livingston et al. (2002). Desorption parameters for both molecules come from Minissale et al. (2022). The CO desorption rate at 50 K implies that a monolayer of material (= 1015 molecules cm−2) is depleted well within a second.
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