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Table 11

Photodissociation branching ratio for neutral CHy molecules under various UV fields: ISRF (Draine 1978), blackbody radiation for three temperatures, and solar UV (Heays et al. 2017).

Reaction ISRF T = 4000 K T = 10 000 K T = 20 000 K Solar KIDA
CH2 + γ
CH/H 0.82 0.85 0.84 0.80 0.85 1.0
C/H2 0.15 0.15 0.15 0.15 0.15 0
C/H/H 0.03 0.00 0.01 0.05 0.00 0

CH3 + γ
CH2/H 0.78 0.83 0.80 0.76 0.83 0.5
CH/H2 0.17 0.17 0.17 0.17 0.17 0.5
CH/H/H 0.00 0.00 0.00 0.01 0.00 0
C/H/H2 0.05 0.00 0.03 0.06 0.00 0
C/H/H/H 0.00 0.00 0.00 0.00 0.00 0

CH4 + γ
CH3/H 0.37 0.47 0.38 0.32 0.47 0.20
CH2∕H2 0.06 0.19 0.07 0.03 0.17 0.60
CH2/H/H 0.38 0.22 0.36 0.43 0.22 0.20
CH/H2∕H 0.17 0.10 0.16 0.18 0.11 0
C/H2∕H2 0.02 0.02 0.02 0.02 0.02 0
CH/H/H/H 0.00 0.00 0.00 0.00 0.00 0
C/H2/H/H 0.00 0.00 0.00 0.01 0.00 0
C/H/H/H/H 0.00 0.00 0.00 0.00 0.00 0

Notes. In the last column are listed the current KIDA BRs (Wakelam et al. 2015).

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