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Table A.1

Collisional and radiative rates.

No. Reaction Rate coefficient cm3s-1/Cross-section σ(cm2) Reference

1 H + e −  →  H +  + 2e −  see reference AAZN97
2 H +  + e −  →  H + γ see reference AAZN97
3 He + e −  →  He +  + 2e −  see reference AAZN97
4 He +  + e −  →  He + γ for Te < 8000 AAZN97
for Te > 8000 AAZN97
5 He +  + e −  →  He +  +  + 2e −  see reference AAZN97
6 He +  +  + e −  →  He +  + γ AAZN97
7 H + e −  →  H −  + γ dex [−17.845    + 0.762(log T)    + 0.1523(log T)2 − 0.03274(log T)3] for T ≤ 6000 GJ07
dex [−16.42    + 0.1998(log T)2 − 5.447 × 10-3(log T)4    + 4.0415
 × 10-5(log T)6] forT > 6000 GJ07
8 H −  + H →  H2 + e 1.5 × 10-9 for T ≤ 300 GJ07
4.0 × 10-9T-0.17 for T ≤ 300 for T > 300 GJ07
9 H + H +  →   + γ dex [−19.38 − 1.523(log T)    + 1.118(log T)2 − 0.1269(log T)3] GJ07
10 H +  →  H2 + H +  6.4 × 10-10 GJ07
11 H −  + H +  →  H + H 5.4 × 10-6T-0.5 + 6.3 × 10-8 − 9.2 × 10-11T0.5 + 4.4 × 10-13T GJ07
12  + e −  →  H + H 1.0 × 10-8 forT ≤ 617 GJ07
1.32 × 10-6T-0.76 forT > 617 GJ07
13 H2 + H +  →   + H see reference GJ07
14 H2 + e −  →  H + H + e −  GJ07
15 H2 + H →  H + H + H GJ07
16 H2 + H2 →  H2 + H + H GJ07
17 D + e −  →  D +  + e −  + e −  see reference GJ07
18 D +  + e −  →  D + γ GJ07
19 H −  + e −  →  H + e −  + e −  see reference GJ07
20 H −  + H →  H + H + e −  see reference GJ07
21 H −  + H →  H2 + e −  6.9 × 10-9T-0.35 for T ≤ 8000 GJ07
9.6 × 10-7T-0.90 for T > 8000 GJ07
22 H + D +  →  D + H +  GJ07
23 D + H +  →  H + D +  for T ≤ 2.0 × 105 GJ07
3.44 × 10-10T0.35 for T > 2.0 × 105 GJ07
24 H2 + D +  →  HD + H +   [0.417 + 0.864log T − 0.137(log T)2] × 10-9 GJ07
25 HD + H +  →  H2 + D +  GJ07
26 H2 + D →  HD + H forT ≤ 200 GJ07
forT > 200 GJ07
27 HD + H →  D + H2 forT ≤ 200 GJ07
forT > 200 GJ07
28 H −  + γ  →  H + e −  for hν > hνth = 0.775   eV AAZN97
29 H2 + γ  →   + e −  σ24 = 0 for hν < 15.42   eV AAZN97
σ24 = 6.2 × 10-18hν − 9.4 × 10-17cm2 for 15.42 ≤ hν < 16.50   eV AAZN97
σ24 = 1.4 × 10-18hν − 1.48 × 10-17cm2 for 16.50 ≤ hν < 17.7   eV AAZN97
σ24 = 0 for hν ≥ 17.7   eVcm2 for hν ≥ 17.7   eV AAZN97
30  + γ  →  H + H + 
for Eth = 2.65   eV2.65 < E < 11.27   eV GJ07
for 11.27 < E < 21.0   eV GJ07
31  + γ  →  2 × H + e −  AAZN97
log (σ26) =  −16.926 − 4.528 × 102hν    + 2.238 × 10-4(hν)2    + 4.245 × 10-7(hν)3
for 30   eV < hν < 90   eV AAZN97
32 H2 + γ  →  H2*  →  H + H 1.12 × 108J(ν) where J the is flux at E=12.87 eV AAZN97
33 H2 + γ  →  H + H for sigma values see reference AAZN97
34 H + γ  →  H +  + e −  AAZN97
35 He +  + γ  →  He +  +  + e −  AAZN97
36 He + γ  →  He +  + e −  AAZN97
37 HD + γ  →  H + D see reference GJ07

Notes. In the table above, T denotes the gas temperature in Kelvin, Te the gas temperature in eV, Tr the temperature of radiation in K. dex(x) = 10x.

References. Acronyms: AAZN97: Abel et al. (1997); GJ07: Glover & Jappsen (2007).

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