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Table A.2.

Grain–surface network used in models B2 and B2alt.

Chemical reaction α β
CO* CRP C* O* 5.00e+00 0.00e+00
OH* CRP O* H* 5.10e+02 0.00e+00
H2O CRP OH* H 9.70e+02 0.00e+00
CO* PHOTON C* O* 2.60e–10 3.53e+00
OH* PHOTON O* H* 3.90e–10 2.24e+00
H2O* PHOTON OH* H* 8.00e–10 2.20e+00
C* O* CO* 1.00e+00 0.00e+00
H* H* H2* 1.00e+00 0.00e+00
H* O* OH* 1.00e+00 0.00e+00
H* OH* H2O* 1.00e+00 0.00e+00
C* OH* CO* H* 1.00e+00 0.00e+00

Notes. The rate coefficients for the surface reactions are constructed as discussed in Sipilä et al. (2015a); a detailed presentation is omitted here for brevity. For the cosmic-ray dissociation and photodissociation reactions, the meaning of the α and β coefficients is the same as for the corresponding gas-phase reactions (Table A.1). For the other reactions α and β represent the branching ratio and activation energy, respectively.

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