Table 3
Main reaction channels in order or relevance for water formation and destruction in the standard disk model.
| Reaction number | Reaction | α [cm3 s-1] or [s-1] | β [-] | γ [K] | Type | References |
|
|
||||||
| 1 | H2 + OH → H2O + H | 2.05 ×10-12 | 1.52 | 1740.00 | Neutral-Neutral | 1 |
| 2 | NH + OH → H2O + N | 3.11 ×10-12 | 1.20 | 0.00 | Neutral-Neutral | 2, 1 |
| 3 | NH2 + OH → H2O + NH | 7.78 ×10-13 | 1.50 | −230.00 | Neutral-Neutral | 1 |
| 4 | NH2 + NO → N2 + H2O | 4.27 ×10-11 | −2.50 | 331.00 | Neutral-Neutral | 2, 1 |
| 5 | OH + OH → H2O + O | 1.65 ×10-12 | 1.14 | 50.00 | Neutral-Neutral | 3 |
| 6 | OH + H2CO → HCO + H2O | 2.22 ×10-12 | 1.42 | −416.00 | Neutral-Neutral | 1 |
| 7 | NH2 + H3O+→ H2O + NH |
9.70 ×10-10 | 0.00 | 0.00 | Ion-Neutral | 4 |
| 8 | H3O+ + Si → SiH+ + H2O | 1.80 ×10-9 | 0.00 | 0.00 | Ion-Neutral | 4 |
| 9 | H3O+ + SiO → SiOH+ + H2O | 2.00 ×10-9 | 0.00 | 0.00 | Ion-Neutral | 5 |
| 10 | H3O+ + e−→ H2O + H | 1.08 ×10-7 | -0.50 | 0.00 | Dissociative recombination | 6 |
| 11 | H− + OH → H2O + e− | 1.00 ×10-10 | -5.22 | 90.00 | Associative detachment | 4 |
| 12 | H + OH → H2O + hν | 5.26 ×10-18 | -5.22 | 90.00 | Radiative association | 7 |
| 13 | H3O+ + hν→ H2O + H+ | 2.00 ×10-11 | 0.00 | 2.00 | Photodissociation | 8 |
| 14 | H + OH → H2O + H |
3.60 ×10-11 | 0.00 | 0.00 | Neutral-Neutrala | 1 |
| 15 | H2O(ice) + dust → H2O + dust | − | − | 4800.00 | Desorptionb | 9, 19 |
| 16 | H2O(ice) + C.R.P. → H2O + dust | − | − | 4800.00 | Cosmic-rays-desorptionb | 19 |
| 17 | H2O(ice) + hν→ H2O | − | − | 4800.00 | Photodesorptionb | 9, 19 |
| 18 | PAH− + H3O+→ PAH + H2O + H | 1.70 ×10-8 | 0.50 | 0.00 | PAH dissociative recombination | 18 |
|
|
||||||
| 1 | H2O + H → OH + H2 | 1.59 ×10-11 | 1.20 | 9610.00 | Neutral-Neutral | 1 |
| 2 | H + H2O → H3O+ + H2 |
5.90 ×10-9 | 0.00 | 0.00 | Ion-Neutral | 10 |
| 3 | C+ + H2O → HCO+ + H | 9.00 ×10-10 | 0.00 | 0.00 | Ion-Neutral | 4 |
| 4 | CH + H2O → H3O+ + CH4 |
3.70 ×10-9 | 0.00 | 0.00 | Ion-Neutral | 10 |
| 5 | H2O + Si+→ SiOH+ + H | 2.30 ×10-10 | 0.00 | 0.00 | Ion-Neutral | 11 |
| 6 | H2O + HCO+→ CO + H3O+ | 2.50 ×10-9 | 0.00 | 0.00 | Ion-Neutral | 12 |
| 7 | H2O + HN → N2 + H3O+ |
2.60 ×10-9 | 0.00 | 0.00 | Ion-Neutral | 13 |
| 8 | H2O + SiH+→ Si+ + H3O+ | 8.00 ×10-10 | 0.00 | 0.00 | Ion-Neutral | 5 |
| 9 | H+ + H2O → H2O+ + H | 6.90 ×10-9 | 0.00 | 0.00 | Charge exchange | 14 |
| 10 | He+ + H2O → He + H2O+ | 6.05 ×10-11 | 0.00 | 0.00 | Charge exchange | 15 |
| 11 | H2O + hν→ OH + H | 5.90 ×10-10 | 0.00 | 1.70 | Photodissociation | 16 |
| 12 | H2O + hν→ H2O+ + e− | 3.30 ×10-11 | 0.00 | 3.90 | Photoionization | 16 |
| 13 | H2O + dust → H2O(ice) | − | − | − | Adsorptionb | 19 |
| 14 | Ne+ + H2O → Ne + H2O+ | 8.00 ×10-10 | 0.00 | 0.00 | Charge exchange | 17 |
Notes.
H2 in a vibrationally excited state, populated by fluorescence from the electronically excited states;
Reference. (1) Mallard et al. (1994); (2) McElroy et al. (2013); (3) Woodall et al. (2007); (4) Prasad & Huntress (1980); (5) Herbst et al. (1989); (6) Tielens & Hollenbach (1985); (7) Field et al. (1980); (8) Jensen et al. (2000); (9) Hollenbach & Gorti (2009); (10) Kim & Huntress (1975); (11) Fahey et al. (1981); (12) Adams et al. (1978); (13) Rakshit (1982); (14) Smith et al. (1992); (15) Mauclaire et al. (1978); (16) van Dishoeck et al. (2006); (17) Anicich (1993); (18) Flower & Pineau des Forêts (2003); (19) Aikawa et al. (1996).
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