Table 5: Additional important reactions at 200 K, for model 2 and Composition A.
Number Reactiona $\alpha $ $\beta $ $\gamma$
107 CO + CRPHOT $\rightarrow $ O + C 1.30e-16 0.00 0.00
125 SO + CRPHOT $\rightarrow $ SO+ + e- 1.30e-14 0.00 0.00
153 H2 + O $\rightarrow $ OH + H      
154 H2 + OH $\rightarrow $ H2O + H 8.40e-13 0.00 1040
166 C + SO $\rightarrow $ S + CO 3.50e-11 0.00 0
173 CH2 + O $\rightarrow $ CO + H + H 1.20e-10 0.00 0
186 O + OH $\rightarrow $ O2 + H      
190 O + H2S $\rightarrow $ HS + OH 9.22e-12 0.00 1800
204 OH + SO $\rightarrow $ SO2 + H      
309 He+ + H2O $\rightarrow $ OH+ + He + H 1.32e-09 -0.50 0.00
360 C+ + H2O $\rightarrow $ HOC+ + H 1.80e-09 -0.50 0.00
436 CH3+ + O $\rightarrow $ HCO+ + H2 2.05e-10 0.00 0.00
437 CH3+ + O $\rightarrow $ HOC+ + H2      
646 He+ + H2O $\rightarrow $ H2O+ + He 1.32e-09 -0.50 0.00
663 C+ + S $\rightarrow $ S+ + C      

a Only rate coefficients that differ by more than 10 percent from the UMIST value are included.

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