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Table A.1.

Gas-phase reaction network used in models B1, B2, and B2alt.

Chemical reaction α β γ Type
H CRP H+ e 4.60e–01 0.00e+00 0.00e+00 1
He CRP He+ e 5.00e–01 0.00e+00 0.00e+00 1
H2 CRP H H 1.00e–01 0.00e+00 0.00e+00 1
H2 CRP H H+ e 2.20e–02 0.00e+00 0.00e+00 1
H2 CRP e 9.30e–01 0.00e+00 0.00e+00 1
C CRP C+ e 1.02e+03 0.00e+00 0.00e+00 1
OH CRP H O 5.10e+02 0.00e+00 0.00e+00 1
H2O CRP H OH 9.70e+02 0.00e+00 0.00e+00 1
CO CRP C O 5.00e+00 0.00e+00 0.00e+00 1
CO CRP CO+ e 3.00e+00 0.00e+00 0.00e+00 1
H2 PHOTON H H 3.40e–11 0.00e+00 2.50e+00 2
C PHOTON C+ e 3.10e–10 0.00e+00 3.33e+00 2
OH PHOTON H O 3.90e–10 0.00e+00 2.24e+00 2
CO PHOTON C O 2.60e–10 0.00e+00 3.53e+00 2
HCO+ PHOTON H+ CO 1.50e–10 0.00e+00 2.50e+00 2
Fe PHOTON Fe+ e 2.80e–10 0.00e+00 2.20e+00 2
H2O PHOTON H OH 8.00e–10 0.00e+00 2.20e+00 2
H2O PHOTON H2O+ e 3.10e–11 0.00e+00 3.90e+00 2
H+ e H PHOTON 3.50e–12 –7.00e–01 0.00e+00 3
e H H 2.53e–07 –5.00e–01 0.00e+00 3
e H H H 4.36e–08 –5.20e-01 0.00e+00 3
e H H2 2.34e–08 –5.20e–01 0.00e+00 3
He+ e He PHOTON 4.50e–12 –6.70e–01 0.00e+00 3
HCO+ e H CO 2.80e–07 –6.90e–01 0.00e+00 3
C+ e C PHOTON 4.40e–12 –6.10e–01 0.00e+00 3
Fe+ e Fe PHOTON 3.70e–12 –6.50e–01 0.00e+00 3
CH+ e C H 7.00e–08 –5.00e–01 0.00e+00 3
OH+ e H O 6.30e–09 –4.80e–01 0.00e+00 3
CO+ e C O 2.75e–07 –5.50e–01 0.00e+00 3
H2O+ e O H2 3.90e–08 –5.00e–01 0.00e+00 3
H2O+ e H OH 8.60e–08 –5.00e–01 0.00e+00 3
H2O+ e H H O 3.05e-07 –5.00e–01 0.00e+00 3
H3O+ e H H OH 2.60e–07 –5.00e–01 0.00e+00 3
H3O+ e H H2O 1.10e–07 –5.00e-01 0.00e+00 3
H3O+ e H2 OH 6.00e–08 –5.00e–01 0.00e+00 3
H3O+ e H O H2 5.60e–09 –5.00e–01 0.00e+00 3
H2 H 2.10e–09 0.00e+00 0.00e+00 3
H H2 H+ 6.40e–10 0.00e+00 0.00e+00 3
C H2 CH+ 2.00e–09 0.00e+00 0.00e+00 3
O H2 OH+ 7.98e–10 –1.56e–01 1.41e+00 3
CO H2 HCO+ 9.45e–01 1.99e–09 2.51e–01 5
Fe H H2 Fe+ 4.90e–09 0.00e+00 0.00e+00 3
H2 He+ H He H+ 3.30e–15 0.00e+00 0.00e+00 3
CO He+ He O C+ 1.00e+00 1.75e–09 2.51e–01 5
H2 He+ He 9.60e–15 0.00e+00 0.00e+00 3
H2 C+ H CH+ 1.50e–10 0.00e+00 4.64e+03 3
OH C+ H CO+ 1.00e+00 9.15e–10 5.50e+00 4
H2 CO+ H HCO+ 7.50e–10 0.00e+00 0.00e+00 3
H2 OH+ H H2O+ 1.10e–09 0.00e+00 0.00e+00 3
H2 H2O+ H H3O+ 6.10e–10 0.00e+00 0.00e+00 3
H2O H2 H3O+ 1.00e+00 1.73e–09 5.41e+00 4
C OH H CO 1.15e–10 –3.39e–01 –1.08e–01 3
H CO+ CO H+ 4.00e–10 0.00e+00 0.00e+00 3

Notes. The form of the rate coefficient is given by the column labeled “type”: (1) k = αζ, where ζ is the cosmic ray ionization rate; (2) k = α exp(− γAV), where AV is the visual extinction; (3) k = β(T/300)β exp(−γ/T); (4) k = αγ(0.62 + 0.4767 γ(300/T)1/2); (5) k = αβ(1 + 0.0967 γ(300/T)1/2 + (γ2/10.526)(300/T)).

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