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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# + PAH Photodesorption
42 PAH–H# + PAH-H
43 PAH–D# + 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 + H + PAH Photodetachment, E(C–H) = 1.4 eV (16 250 K)
                 
52 PAH–D + 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 = EH2−HD

67 PAH + PAH+ + e Photoionisation
68 PAH + e PAH Electron attachment
69 PAH + 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 Radiative attachment
74 D + e D 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 + 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 + H + H Photodissociation including self-shielding
86 HD + 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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