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Table B.1

Photodissociation and photoionization rates for various radiation fields.

Interstellara T Taurib Herbig Ae/Bec



Reaction α (s−1) γ α (s−1) γ α (s−1) γ
CH + → C + H 9.8 × 10−10 1.58 9.9 × 10−10 1.02 2.5 × 10−9 0.89
CH + → CH+ + e 9.3 × 10−10 3.20 1.6 × 10−10 2.71 1.1 × 10−11 2.64
CH+ + → C + H+ 3.3 × 10−10 3.02 1.0 × 10−10 2.39 2.2 × 10−11 1.89
CH2 + → CH + H 6.5 × 10−10 1.89 3.3 × 10−10 1.45 9.4 × 10−10 1.42
CH3 + → CH2 + H 3.6 × 10−10 2.06 2.0 × 10−10 1.55 4.8 × 10−10 1.54
CH3 + → CH + H2 3.6 × 10−10 2.06 2.0 × 10−10 1.55 4.8 × 10−10 1.54
CH3 + → CH + e 3.3 × 10−10 2.91 5.4 × 10−10 2.23 8.1 × 10−12 2.32
CH4 + → CH3 + H 4.7 × 10−10 2.75 7.8 × 10−10 2.22 5.3 × 10−11 2.07
CH4 + → CH2 + H2 8.8 × 10−10 2.83 1.0 × 10−9 2.23 7.0 × 10−11 2.09
CH4 + → CH + H2 + H 1.2 × 10−10 2.83 1.4 × 10−10 2.23 9.7 × 10−12 2.09
CH4 + → CH + e 1.4 × 10−11 3.95 1.8 × 10−12 3.36 1.4 × 10−13 3.37
C2 + → C + C 1.3 × 10−10 2.97 3.9 × 10−11 2.52 3.4 × 10−12 2.45
C2 + → C + e 2.1 × 10−10 3.82 3.9 × 10−11 3.23 2.3 × 10−12 3.22
C2H + → C2 + H 1.6 × 10−9 2.48 1.8 × 10−9 2.13 5.6 × 10−10 1.83
C2H2 + → C2H + H 4.4 × 10−9 2.46 4.2 × 10−9 2.08 1.9 × 10−9 1.81
C2H2 + → C2H + e 3.3 × 10−10 3.37 9.0 × 10−11 2.87 6.0 × 10−12 2.87
OH + → O + H 3.8 × 10−10 2.33 5.1 × 10−10 1.99 1.7 × 10−10 1.62
OH + → OH+ + e 5.2 × 10−12 3.95 6.5 × 10−13 3.35 5.5 × 10−14 3.37
H2O + → OH + H 6.8 × 10−10 2.22 1.4 × 10−9 2.01 3.4 × 10−10 1.52
H2O + → O + H2 1.0 × 10−10 2.70 3.5 × 10−10 2.21 9.5 × 10−12 1.74
H2O + → H2O+ + e 2.7 × 10−11 3.84 6.2 × 10−12 3.22 3.6 × 10−13 3.23
O2 + → O + O 7.3 × 10−10 2.31 3.5 × 10−10 1.81 5.6 × 10−10 1.77
O2 + → O + e 5.1 × 10−11 3.72 1.2 × 10−11 3.08 8.6 × 10−13 3.08
H2CO + → CO + H2 1.6 × 10−9 2.16 2.5 × 10−9 1.80 1.0 × 10−9 1.37
H2CO + → H2CO+ + e 4.3 × 10−10 3.22 1.0 × 10−10 2.76 7.6 × 10−12 2.69
CO2 + → CO + O 1.1 × 10−9 3.01 2.4 × 10−10 2.41 4.3 × 10−11 1.93
NH + → N + H 4.8 × 10−10 2.46 2.0 × 10−10 2.00 2.7 × 10−10 1.94
NH + → NH+ + e 1.8 × 10−12 4.00 7.4 × 10−15 3.41 1.7 × 10−14 3.42
NH2 + → NH + H 8.9 × 10−10 1.92 4.2 × 10−10 1.50 1.1 × 10−9 1.47
NH2 + → NH + e 1.1 × 10−10 3.44 3.1 × 10−11 2.92 2.1 × 10−12 2.91
NH3 + → NH2 + H 1.2 × 10−9 1.99 6.9 × 10−10 1.58 1.2 × 10−9 1.41
NH3 + → NH + H2 3.1 × 10−10 2.72 1.1 × 10−9 2.21 3.6 × 10−11 2.03
NH3 + → NH + e 4.2 × 10−10 3.04 1.8 × 10−10 2.34 8.2 × 10−12 2.50
N2 + → N + N 3.6 × 10−10 3.81 7.6 × 10−11 3.21 3.9 × 10−12 3.19
CN + → C + N 1.0 × 10−9 3.55 1.8 × 10−10 3.02 1.2 × 10−11 3.04
HCN + → CN + H 1.9 × 10−9 2.82 4.5 × 10−9 2.22 1.6 × 10−10 2.01
HNC + → CN + H 9.4 × 10−10 2.45 3.2 × 10−9 2.16 3.9 × 10−10 1.80
NO + → N + O 4.7 × 10−10 2.01 2.3 × 10−10 1.60 4.1 × 10−10 1.41
NO + → NO+ + e 2.6 × 10−10 3.00 2.4 × 10−10 2.27 8.7 × 10−12 2.24
SH + → S + H 1.3 × 10−9 1.89 2.0 × 10−9 1.54 1.8 × 10−9 1.30
SH+ + → S + H+ 6.9 × 10−10 1.89 3.2 × 10−10 1.05 3.9 × 10−10 0.80
H2 S + → SH + H 3.2 × 10−9 2.26 3.4 × 10−9 1.91 1.8 × 10−9 1.58
H2 S + → H2 S+ + e 7.2 × 10−10 3.15 1.7 × 10−10 2.68 1.3 × 10−11 2.61
CS + → C + S 9.5 × 10−10 2.60 4.2 × 10−9 2.20 1.7 × 10−10 1.98
CS + → CS+ + e 1.7 × 10−10 3.30 4.1 × 10−11 2.81 2.8 × 10−12 2.81
SO + → S + O 4.8 × 10−9 2.24 1.1 × 10−8 2.01 2.1 × 10−9 1.47
SO + → SO+ + e 2.1 × 10−10 3.18 5.3 × 10−11 2.72 4.0 × 10−12 2.64
SO2 + → SO + O 1.2 × 10−9 2.25 2.1 × 10−9 1.97 5.5 × 10−10 1.47
SO2 + → S + O2 1.1 × 10−9 2.29 2.1 × 10−9 2.02 4.1 × 10−10 1.47
SO2 + → SO + e 1.3 × 10−10 3.77 3.0 × 10−11 3.17 2.1 × 10−12 3.16
HF + → H + F 1.3 × 10−10 2.57 3.1 × 10−10 2.18 2.7 × 10−11 1.84
HCl + → H + Cl 2.0 × 10−9 2.53 7.7 × 10−10 1.99 4.2 × 10−10 1.68
HCl + → HCl+ + e 1.9 × 10−11 3.91 2.7 × 10−12 3.33 1.7 × 10−13 3.35
C + → C+ + e 3.3 × 10−10 3.28 8.4 × 10−11 2.82 5.8 × 10−12 2.80
Si + → Si+ + e 4.2 × 10−9 2.49 4.4 × 10−9 2.13 2.1 × 10−9 1.91
P + → P+ + e 1.1 × 10−9 2.99 2.5 × 10−10 2.48 2.3 × 10−11 2.45
S + → S+ + e 9.7 × 10−10 3.09 2.1 × 10−10 2.62 1.8 × 10−11 2.55
Cl + → Cl+ + e 4.7 × 10−11 3.94 6.1 × 10−12 3.35 4.4 × 10−13 3.36
Na + → Na+ + e 1.3 × 10−11 2.12 1.6 × 10−11 1.68 8.4 × 10−12 1.47
Mg + → Mg+ + e 6.7 × 10−11 2.29 4.4 × 10−11 1.80 5.4 × 10−11 1.73
Fe + → Fe+ + e 4.7 × 10−10 2.45 6.9 × 10−10 2.02 2.8 × 10−10 1.88

Notes. (a) Interstellar radiation field (ISRF) of Draine (1978); see expressions in Sect. 2.1.1. (b) Radiation field of TW Hya scaled to the FUV energy density of the ISRF. (c)Radiation field of AB Aurigae scaled to the FUV energy density of the ISRF.

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