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Table 1
Dust properties.
| Properties | “Standard” | Hasegawa et al. (1992) | Amorphous carbon | Olivine |
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| s sticking factor (1−10 K) | 1 | |||
| amin (μm) | 0.03 | |||
| amax (μm) | 0.3 | |||
| Dust to gas mass ratio, G | 0.01 | |||
| Density, ρgr (g cm-3) | 3 | 2.16 | 3 | |
| H binding energy, Eb (meV) | – | 30.16 | 56.7 | 32.1 |
| H diffusion barrier, Ed (meV) | – | 8.62 | 44 | 24.7 |
| Surface density of adsorption sites, ns (cm-2) | 1.5 × 1015 | 5 × 1013 | 2 × 1014 | |
| Mean distance between adsorption Sites, ds ( Å ) | 2.6 | 2.6 | 14.14 | 7.07 |
| Hoping rate, ν0 (s-1) with d0 = 1 Å | 1012 | 7.6 × 1012 | 10.5 × 1012 | 7.9 × 1012 |
Notes. We assume that adsorption sites are regularly distributed across the grain surface such that the mean distance between them, d, is the inverse of the square root of their surface number density ns. See references in text.
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