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Table B.1
List of symbols and their explanation.
| Symbol | Parameter |
|
|
|
| ad | diameter of interstellar grains (in μm) |
| ds | size of each site (in Å ) |
| Ed | barrier energy against diffusion of a considered species (in K) |
| Eb | barrier energy against desorption of a considered species (in K) |
| Ea | activation energy of the CO and H2CO hydrogenation reactions (in K) |
| Fpor | fraction of the grain surface occupied by the pores |
| Fnp | fraction of the grain surface occupied by the non-porous surface |
| Fed | fraction of the grain surface occupied by the edge porous sites |
| rd | radius of interstellar grains (in μm) |
| nd | density of interstellar grains (in cm-3) |
| Npore | number of sites occupied by each pore |
| Ns | number of sites of the considered layer |
| nH | total density of H nuclei (in cm-3) |
| ng | gas phase density of a considered species (in cm-3) |
| Pnp | surface population of a considered species in the non-porous surface (in monolayers) |
| Ppor | surface population of a considered species in the pores (in monolayers) |
| Racc | accretion rate of a considered species (in s-1) |
| Rhop | hopping rate from site to site of a considered species (in s-1) |
| Rdiff | diffusion rate of a considered species (in s-1) |
| Rr,np | reaction rate of a considered reaction in the non-porous surface (in s-1) |
| Rr,por | reaction rate of a considered reaction in the pores (in s-1) |
| Rev | evaporation rate of a considered species (in s-1) |
| S | sticking coefficient of a considered species |
| σd | cross section of interstellar grains (in cm2) |
| Tg | gas temperature (in K) |
| Td | dust temperature (in K) |
| v | thermal velocity of a considered species in the gas phase (in cm s-1) |
| Xd | abundance of interstellar grains relative to H nuclei |
| Xg | abundance relative to H nuclei of a considered species in the gas phase |
| Xm | abundance relative to H nuclei of a considered species on grain mantles |
| ζ | cosmic rays ionization rate (in s-1) |
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