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Table D.3

Main gas-phase and singly-hydrogenated PAH reactions.

Reaction Comment
35 PAH → PAH# Physisorption
36 PAH-H → PAH-H# –
37 PAH–D → PAH-D# –
38 PAH# → PAH See Eq. (B.33)
39 PAH–H# → PAH-H –
40 PAH–D# → PAH-D –
41 PAH# + hν → PAH Photodesorption
42 PAH–H# + hν → PAH-H –
43 PAH–D# + hν → PAH-D –
44 PAH# + CR → PAH Cosmic-ray induced photodesorption
45 PAH–H# + CR → PAH-H –
46 PAH–D# + CR → PAH-D –
47 H + PAH → PAH-H = 324 K (Boschman et al. 2015)
                 
48 D + PAH → PAH–D = + ΔEH-D, D-mass scaling of
                 
49 PAH-H → H + PAH Thermal H-detachment with = 16 250 K
                 
50 PAH–D → D + PAH = +
                 
51 PAH–H + hν → H + PAH Photodetachment, E(C–H) = 1.4 eV (16 250 K)
                 
52 PAH–D + hν → D + PAH E(C–D) = 4.367 eV (50677.2 K)
                 
53 PAH–H + H → H2 + PAH σ = 0.06 Å2/C atom, Eact = 0 K(a)
                 
54 PAH–H + D → HD + PAH Ten-fold H cross-section σ = 0.06–0.6 Å2/C atom
                 
55 PAH-D + H → HD + PAH Same as for PAH–H
56 H + PAH+ → PAH-H+ = 116 K
                 
57 D + PAH+ → PAH-D+ = + ΔEH-D
                 
58 PAH-H+ + e → PAH + H Dissociative recombination
59 PAH–D+ + e → PAH + D –
60 PAH–H+ + H → PAH+ + H2 Langevin rate (Montillaud et al. 2013)
61 PAH–H+ + D → PAH+ + HD Same as for PAH-H+
                 
62 PAH–D+ + H → PAH+ + HD Same as for PAH-H+
                 
63 PAH–H+ + HD → PAH-D+ + H2
64 PAH–D+ + H2 → PAH–H+ + HD Endothermic, ΔEreac = ΔEH2−HD -
65 H2 + PAH → PAH-H + H –H–H = 3481 K
                 
66 HD + PAH → PAH-D + H = +ΔEH2−HD
67 PAH + hν → PAH+ + e Photoionisation
68 PAH + e → PAH− Electron attachment
69 PAH− + hν → PAH + e Photodetachement
70 PAH+ + e → PAH Electron recombination
71 PAH+ + X → PAH + X+ Charge exchange with species X
72 PAH + X+ → PAH+ + X X = H and C, rates from Wolfire et al. (2008)
73 H + e− → H− hν Radiative attachment
74 D + e− → D− hν Radiative attachment
75 H + H− → H2 + e− Associative detachment
76 H + D− → HD + e− Associative detachment
77 D + H− → HD + e− Associative detachment
78 H + D → HD + hν Radiative association (Stancil & Dalgarno 1997)
79 H2 + D+ → HD + H+ Honvault & Scribano (2013)
80 HD + H+ → H2 + D+ ΔEreac = −416 K
81 H2 + D → HD + H Simbotin et al. (2011)
82 HD + H → H2 + D ΔEreac = −416 K
83 H + H + H → H2 + H Three-body reactions
84 H + H + H2 → H2 + H2 –
85 H2 + hν → H + H Photodissociation including self-shielding
86 HD + hν → H + D Photodissociation including self-shielding
87 H2 + CR → H + H By secondary electrons and CR-generated UV photons
88 HD + CR → D + D –

Notes. The energies are expressed in units of Kelvin. ΔEH-D = 58 K (5 meV), = 970 K (83 meV), ΔEH2 −HD = 415.8 K.

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