Table 1: Chemical surface reactions r assumed to form the solid materials s. The efficiency of the reaction is limited by the collision rate of the key species, which has the lowest abundance among the reactants. The notation ${\scriptstyle{}^1\!\!/\!{}_2}$ in the rhs column means that only every second collision (and sticking) event initiates one reaction (see $\nu ^{\rm key}_r$ in Eqs. (4) and (10)). Data sources for the supersaturation ratios (and saturation vapour pressures): (1) Helling & Woitke (2006); (2) Nuth & Ferguson (2006); (3) Sharp & Huebner (1990).
Index r Solid s Surface reaction Key species
1 TiO2[s] TiO2 $\longrightarrow$ TiO2[s] TiO2
2 rutile Ti + 2 H2O $\longrightarrow$ TiO2[s] + 2 H2 Ti
3 (1) TiO + H2O $\longrightarrow$ TiO2[s] + H2 TiO
4   TiS + 2 H2O $\longrightarrow$ TiO2[s] + H2S + H2 TiS
5 SiO2[s] SiO2 $\longrightarrow$ SiO2[s] SiO2
6 silica SiO + H2O $\longrightarrow$ SiO2[s] + H2 SiO
7 (3) SiS + 2 H2O $\longrightarrow$ SiO2[s] + H2S + H2 SiS
8 SiO[s] SiO $\longrightarrow$ SiO[s] SiO
9 silicon mono-oxide SiO2 + H2 $\longrightarrow$ SiO[s] + H2O SiO2
10 (2) SiS + H2O $\longrightarrow$ SiO[s] + H2S SiS
11 Fe[s] Fe $\longrightarrow$ Fe[s] Fe
12 solid iron FeO + H2 $\longrightarrow$ Fe[s] + H2O FeO
13 (1) FeS + H2 $\longrightarrow$ Fe[s] + H2S FeS
14   Fe(OH)2 + H2 $\longrightarrow$ Fe[s] + 2 H2O Fe(OH)2
15 FeO[s] FeO $\longrightarrow$ FeO[s] FeO
16 iron (II) oxide Fe + H2O $\longrightarrow$ FeO[s] + H2 Fe
17 (3) FeS + H2O $\longrightarrow$ FeO[s] + H2S FeS
18   Fe(OH)2 $\longrightarrow$ FeO[s] + H2 Fe(OH)2
19 FeS[s] FeS $\longrightarrow$ FeS[s] FeS
20 iron sulphide Fe + H2S $\longrightarrow$ FeS[s] + H2 Fe
21 (3) FeO + H2S $\longrightarrow$ FeS[s] + H2O $\min\{$FeO, H2S$\}$
22   Fe(OH)2 + H2S $\longrightarrow$ FeS[s] + 2 H2O $\min\{$Fe(OH)2, H2S$\}$
23 Fe2O3[s] 2 Fe + 3 H2O $\longrightarrow$ Fe2O3[s] + 3 H2 ${\scriptstyle{}^1\!\!/\!{}_2}$Fe
24 iron (III) oxide 2 FeO + H2O $\longrightarrow$ Fe2O3[s] + H2 ${\scriptstyle{}^1\!\!/\!{}_2}$FeO
25 (3) 2 FeS + 3 H2O $\longrightarrow$ Fe2O3[s] + 2 H2S + H2 ${\scriptstyle{}^1\!\!/\!{}_2}$FeS
26   2 Fe(OH)2 $\longrightarrow$ Fe2O3[s] + H2O + H2 ${\scriptstyle{}^1\!\!/\!{}_2}$Fe(OH)2
27 MgO[s] MgO $\longrightarrow$ MgO[s] MgO
28 periclase Mg + H2O $\longrightarrow$ MgO[s] + H2 Mg
29 (3) 2 MgOH $\longrightarrow$ 2 MgO[s] + H2 ${\scriptstyle{}^1\!\!/\!{}_2}$MgOH
30   Mg(OH)2 $\longrightarrow$ MgO[s] + H2O Mg(OH)2
31 MgSiO3[s] Mg + SiO + 2 H2O $\longrightarrow$ MgSiO3[s] + H2 $\min\{$Mg, SiO$\}$
32 enstatite Mg + SiS + 3 H2O $\longrightarrow$ MgSiO3[s] + H2S + 2 H2 $\min\{$Mg, SiS$\}$
33 (3) 2 MgOH + 2 SiO + 2 H2O $\longrightarrow$ 2 MgSiO3[s] + 3 H2 $\min\{{\scriptstyle{}^1\!\!/\!{}_2}$MgOH, ${\scriptstyle{}^1\!\!/\!{}_2}$SiO$\}$
34   2 MgOH + 2 SiS + 2 H2O $\longrightarrow$ 2 MgSiO3[s] + 2 H2S + 2 H2 $\min\{{\scriptstyle{}^1\!\!/\!{}_2}$MgOH, ${\scriptstyle{}^1\!\!/\!{}_2}$SiS$\}$
35   Mg(OH)2 + SiO $\longrightarrow$ 2 MgSiO3[s] + H2 $\min\{$Mg(OH)2, SiO$\}$
36   Mg(OH)2 + SiS + H2O $\longrightarrow$ MgSiO3[s] + H2S+ H2 $\min\{$Mg(OH)2, SiS$\}$
37 Mg2SiO4[s] 2 Mg + SiO + 3 H2O $\longrightarrow$ Mg2SiO4[s] + 3 H2 $\min\{{\scriptstyle{}^1\!\!/\!{}_2}$Mg, SiO$\}$
38 forsterite 2 MgOH + SiO + H2O $\longrightarrow$ Mg2SiO4[s] + 2 H2 $\min\{{\scriptstyle{}^1\!\!/\!{}_2}$MgOH, SiO$\}$
39 (3) 2 Mg(OH)2 + SiO $\longrightarrow$ Mg2SiO4[s] + H2O + H2 $\min\{{\scriptstyle{}^1\!\!/\!{}_2}$Mg(OH)2, SiO$\}$
40   2 Mg + SiS + 4 H2O $\longrightarrow$ Mg2SiO4[s] + H2S + 3 H2 $\min\{{\scriptstyle{}^1\!\!/\!{}_2}$Mg, SiS}
41   2 MgOH + SiS + 2 H2O $\longrightarrow$ Mg2SiO4[s] + H2S + 2 H2 $\min\{{\scriptstyle{}^1\!\!/\!{}_2}$MgOH, SiS}
42   2 Mg(OH)2 + SiS $\longrightarrow$ Mg2SiO4[s] + H2 + H2S $\min\{{\scriptstyle{}^1\!\!/\!{}_2}$Mg(OH)2, SiS}
43 Al2O3[s] 2 Al + 3 H2O $\longrightarrow$ Al2O3[s] + 3 H2 ${\scriptstyle{}^1\!\!/\!{}_2}$Al
44 aluminia 2 AlOH + H2O $\longrightarrow$ Al2O3[s] + 2 H2 ${\scriptstyle{}^1\!\!/\!{}_2}$AlOH
45 (3) 2 AlH + 3 H2O $\longrightarrow$ Al2O3[s] + 4 H2 ${\scriptstyle{}^1\!\!/\!{}_2}$AlH
46   Al2O + 2 H2O $\longrightarrow$ Al2O3[s] + 2 H2 Al2O
47   2 AlS + 3 H2O $\longrightarrow$ Al2O3[s] + 2 H2S + H2 ${\scriptstyle{}^1\!\!/\!{}_2}$AlS
48   2 AlO2H $\longrightarrow$ Al2O3[s] + H2O ${\scriptstyle{}^1\!\!/\!{}_2}$AlO2H
49 CaTiO3[s] Ca + TiO + 2 H2O $\longrightarrow$ CaTiO3[s] + 2 H2 $\min\{$Ca, TiO$\}$
50 perovskite Ca + TiO2 + H2O $\longrightarrow$ CaTiO3[s] + H2 $\min\{$Ca, TiO$_2\}$
51 (3) Ca + Ti + 3 H2O $\longrightarrow$ CaTiO3[s] + 3 H2 $\min\{$Ca, Ti$\}$
52   CaO + Ti + 2 H2O $\longrightarrow$ CaTiO3[s] + 2 H2 $\min\{$CaO, Ti$\}$
53   CaO + TiO + H2O $\longrightarrow$ CaTiO3[s] + H2 $\min\{$CaO, TiO$\}$
54   CaO + TiO2 $\longrightarrow$ CaTiO3[s] $\min\{$CaO, TiO$_2\}$
55   CaS + Ti + 3 H2O $\longrightarrow$ CaTiO3[s] + H2S + H2 $\min\{$CaS, Ti$\}$
56   CaS + TiO + 2 H2O $\longrightarrow$ CaTiO3[s] + H2S + 2 H2 $\min\{$CaS, TiO$\}$
57   CaS + TiO2 + H2O $\longrightarrow$ CaTiO3[s] + H2S $\min\{$CaS, TiO$_2\}$
58   Ca(OH)2 + Ti + H2O $\longrightarrow$ CaTiO3[s] + 2 H2 $\min\{$Ca(OH)2, Ti$\}$
59   Ca(OH)2 + TiO $\longrightarrow$ CaTiO3[s] + H2 $\min\{$Ca(OH)2, TiO$\}$
60   Ca(OH)2 + TiO2 $\longrightarrow$ CaTiO3[s] + H2O $\min\rm\{Ca(OH)_2,TiO_2\}$


Source LaTeX | All tables | In the text