Free Access
Table 1.
Model parameters.
| Parameter | Symbol | Value |
|---|---|---|
| Sticking coefficient | Ps | 0.5 |
| Reactive desorption efficiency | aRRK | 0.01 |
| Ratio of surface diffusion barriers to desorption energies | Eb1∕ Ed | 0.5 |
| Ratio of bulk diffusion barriers to desorption energies | Eb2∕ Ed | 0.7 |
| Barrier thickness | b | 1 Å |
| Grain radius | r | 0.1 μm |
| Dust grain density | ρd | 3 g cm−3 |
| Dust-to-gas mass ratio | md∕g | 0.01 |
| Number of absorption sites on each grain | S | 1.0 × 106 |
| Surface density of sites | NS | 7.96 × 1014 sites cm−2 |
| Unattenuated FUV flux | χ | χ0 = 1 |
| Cosmic ray ionization rate | ζCR | 1.3 × 10−17 s−1 |
| Fraction of the timescale between two cosmic-ray heating events | f | 3.16 × 10−19 |
| Characteristic vibrational frequency | ν0 | 1 × 1012 s−1 |
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.