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Table B.1
New ion-neutral chemical reaction rates and ortho-para branching ratios.
| Chemical reactionsa | α | β | γ | kb | References | NSBRc | |||||
| cm3 s-1 | cm3 s-1 | ||||||||||
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Formation of H |
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H (o) |
H2(o) | → | H(o) |
H | 1.40(−9) | 0.00 | 0.00 | 1.40(−9) | 1 | 2/3 | |
| H(o) |
H2(o) | → | H(p) |
H | 7.00(−10) | 0.00 | 0.00 | 7.00(−10) | 1 | 1/3 | |
| H(o) |
H2(p) | → | H(o) |
H | 7.00(−10) | 0.00 | 0.00 | 7.00(−10) | 1 | 1/3 | |
| H(o) |
H2(p) | → | H(p) |
H | 1.40(−9) | 0.00 | 0.00 | 1.40(−9) | 1 | 2/3 | |
| H(p) |
H2(o) | → | H(o) |
H | 7.00(−10) | 0.00 | 0.00 | 7.00(−10) | 1 | 1/3 | |
| H(p) |
H2(o) | → | H(p) |
H | 1.40(−9) | 0.00 | 0.00 | 1.40(−9) | 1 | 2/3 | |
| H(p) |
H2(p) | → | H(p) |
H | 2.10(−9) | 0.00 | 0.00 | 2.10(−9) | 1 | 1 | |
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| Main ortho-to-para conversion reactions of H2 | |||||||||||
| H(o) |
H2(o) | → | H(o) |
H2(p) | 9.67(−11) | 0.00 | −0.14 | 9.81(−11) | 2 | ||
| H(o) |
H2(o) | → | H(p) |
H2(o) | 4.00(−10) | 0.00 | −0.19 | 4.08(−10) | 2 | ||
| H(o) |
H2(o) | → | H(p) |
H2(p) | 1.04(−10) | 0.00 | −0.14 | 1.04(−10) | 2 | ||
| H(o) |
H2(p) | → | H(o) |
H2(o) | 8.84(−10) | 0.00 | 170 | 3.66(−17) | 2 | ||
| H(o) |
H2(p) | → | H(p) |
H2(o) | 1.50(−9) | 0.00 | 136.2 | 1.82(−15) | 2 | ||
| H(p) |
H2(o) | → | H(o) |
H2(o) | 8.03(−10) | 0.00 | 32.6 | 3.08(−11) | 2 | ||
| H(p) |
H2(o) | → | H(o) |
H2(p) | 3.46(−10) | 0.00 | −0.69 | 3.71(−10) | 2 | ||
| H(p) |
H2(o) | → | H(p) |
H2(p) | 2.98(−10) | 0.00 | −0.69 | 3.19(−10) | 2 | ||
| H(p) |
H2(p) | → | H(p) |
H2(p) | 5.88(−10) | 0.00 | 198.2 | 1.45(−18) | 2 | ||
| H(p) |
H2(p) | → | H(p) |
H2(p) | 8.16(−10) | 0.00 | 164.9 | 5.63(−17) | 2 | ||
| H+ | H2(o) | → | H+ | H2(p) | 1.82(−10) | 0.13 | −0.02 | 1.17(−10) | 3 | ||
| H+ | H2(p) | → | H+ | H2(o) | 1.64(−9) | 0.13 | 170.5 | 4.15(−17) | 3 | ||
| HCO+ | H2(o) | → | HCO+ | H2(p) | 1.27(−10) | 0.00 | 0.00 | 1.27(−10) | 4 | ||
| HCO+ | H2(p) | → | HCO+ | H2(o) | 1.14(−9) | 0.00 | 170.5 | 4.49(−17) | 4 | ||
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| Nitrogen hydrides formation | |||||||||||
| N+ | H2(o) | → | NH+ | H | 4.20(−10) | −0.15 | 44.1 | 8.50(−12) | 5 | ||
| N+ | H2(p) | → | NH+ | H | 8.35(−10) | 0.00 | 168.5 | 4.02(−17) | 5 | ||
| NH+ | H2(o) | → | NH(o) |
H | 1.06(−9) | 0.00 | 0.00 | 1.06(−9) | 6 | 5/6 | |
| NH+ | H2(o) | → | NH(p) |
H | 2.13(−10) | 0.00 | 0.00 | 2.13(−10) | 6 | 1/6 | |
| NH+ | H2(p) | → | NH(o) |
H | 6.38(−10) | 0.00 | 0.00 | 6.38(−10) | 6 | 1/2 | |
| NH+ | H2(p) | → | NH(p) |
H | 6.38(−10) | 0.00 | 0.00 | 6.38(−10) | 6 | 1/2 | |
| NH(o) |
H2(o) | → | NH(o) |
H | 1.80(−10) | 0.00 | 0.00 | 1.80(−10) | 6 | 2/3 | |
| NH(o) |
H2(o) | → | NH(p) |
H | 9.00(−11) | 0.00 | 0.00 | 9.00(−11) | 6 | 1/3 | |
| NH(o) |
H2(p) | → | NH(o) |
H | 9.00(−11) | 0.00 | 0.00 | 9.00(−11) | 6 | 1/3 | |
| NH(o) |
H2(p) | → | NH(p) |
H | 1.80(−10) | 0.00 | 0.00 | 1.80(−10) | 6 | 2/3 | |
| NH(p) |
H2(o) | → | NH(o) |
H | 9.00(−11) | 0.00 | 0.00 | 9.00(−11) | 6 | 1/3 | |
| NH(p) |
H2(o) | → | NH(p) |
H | 1.80(−10) | 0.00 | 0.00 | 1.80(−10) | 6 | 2/3 | |
| NH(p) |
H2(p) | → | NH(p) |
H | 2.70(−10) | 0.00 | 0.00 | 2.70(−10) | 6 | 1 | |
| NH(o) |
H2(o) | → | NH (I = 2) |
H | 1.40(−12) | 0.00 | 0.00 | 1.40(−12) | 6 | 7/12 | |
| NH(o) |
H2(o) | → | NH(I = 1) |
H | 8.40(−13) | 0.00 | 0.00 | 8.40(−13) | 6 | 21/60 | |
| NH(o) |
H2(o) | → | NH(I = 0) |
H | 1.60(−13) | 0.00 | 0.00 | 1.60(−13) | 6 | 1/15 | |
| NH(o) |
H2(p) | → | NH(I = 2) |
H | 1.80(−12) | 0.00 | 0.00 | 1.80(−12) | 6 | 1/4 | |
| NH(o) |
H2(p) | → | NH(I = 1) |
H | 6.00(−13) | 0.00 | 0.00 | 6.00(−13) | 6 | 3/4 | |
| NH(o) |
H2(p) | → | NH(I = 0) |
H | 0.00 | 0.00 | 0.00 | 0.00 | 6 | 0 | |
| NH(p) |
H2(o) | → | NH(I = 2) |
H | 4.00(−13) | 0.00 | 0.00 | 4.00(−13) | 6 | 1/6 | |
| NH(p) |
H2(o) | → | NH(I = 1) |
H | 1.68(−12) | 0.00 | 0.00 | 1.68(−12) | 6 | 21/30 | |
| NH(p) |
H2(o) | → | NH(I = 0) |
H | 3.20(−13) | 0.00 | 0.00 | 3.20(−13) | 6 | 2/15 | |
| NH(p) |
H2(p) | → | NH(I = 2) |
H | 0.00 | 0.00 | 0.00 | 0.00 | 6 | 0 | |
| NH(p) |
H2(p) | → | NH(I = 1) |
H | 1.44(−12) | 0.00 | 0.00 | 1.44(−12) | 6 | 3/5 | |
| NH(p) |
H2(p) | → | NH(I = 0) |
H | 9.60(−13) | 0.00 | 0.00 | 9.60(−13) | 6 | 2/5 | |
Destruction of nitrogen hydrides by  , HCO+, and N2H+ |
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| H(p) |
NH | → | NH(p) |
H2(p) | 1.63(−10) | 0.00 | 0.00 | 1.63(−10) | 7 | 1/8 | |
| H(p) |
NH | → | NH(o) |
H2(p) | 3.25(−10) | 0.00 | 0.00 | 3.25(−10) | 7 | 1/4 | |
| H(p) |
NH | → | NH(p) |
H2(o) | 3.25(−10) | 0.00 | 0.00 | 3.25(−10) | 7 | 1/4 | |
| H(p) |
NH | → | NH(o) |
H2(o) | 4.88(−10) | 0.00 | 0.00 | 4.88(−10) | 7 | 3/8 | |
| H(p) |
NH2(p) | → | NH(p) |
H2(p) | 7.20(−10) | 0.00 | 0.00 | 7.20(−10) | 7 | 8/5/4 | |
| H(p) |
NH2(p) | → | NH(p) |
H2(o) | 7.20(−10) | 0.00 | 0.00 | 7.20(−10) | 7 | 8/5/4 | |
| H(p) |
NH2(p) | → | NH(o) |
H2(o) | 3.60(−10) | 0.00 | 0.00 | 3.60(−10) | 7 | 4/5/4 | |
| H(p) |
NH2(o) | → | NH(p) |
H2(o) | 8.40(−10) | 0.00 | 0.00 | 8.40(−10) | 7 | 28/5/12 | |
| H(p) |
NH2(o) | → | NH(o) |
H2(o) | 4.20(−10) | 0.00 | 0.00 | 4.20(−10) | 7 | 14/5/12 | |
| H(p) |
NH2(o) | → | NH(p) |
H2(p) | 2.40(−10) | 0.00 | 0.00 | 2.40(−10) | 7 | 8/5/12 | |
| H(p) |
NH2(o) | → | NH(o) |
H2(p) | 3.00(−10) | 0.00 | 0.00 | 3.00(−10) | 7 | 2/12 | |
| H(p) |
NH3(p) | → | NH(I = 0) |
H2(p) | 9.10(−10) | 0.00 | 0.00 | 9.10(−10) | 8 | 8/5/16 | |
| H(p) |
NH3(p) | → | NH(I = 1) |
H2(p) | 2.28(−9) | 0.00 | 0.00 | 2.28(−9) | 8 | 4/16 | |
| H(p) |
NH3(p) | → | NH(I = 0) |
H2(o) | 1.52(−9) | 0.00 | 0.00 | 1.52(−9) | 8 | 8/3/16 | |
| H(p) |
NH3(p) | → | NH(I = 1) |
H2(o) | 3.64(−9) | 0.00 | 0.00 | 3.64(−9) | 8 | 32/5/16 | |
| H(p) |
NH3(p) | → | NH(I = 2) |
H2(o) | 7.58(−10) | 0.00 | 0.00 | 7.58(−10) | 8 | 4/3/16 | |
| H(p) |
NH3(o) | → | NH(I = 0) |
H2(o) | 7.58(−10) | 0.00 | 0.00 | 7.58(−10) | 8 | 4/3/16 | |
| H(p) |
NH3(o) | → | NH(I = 1) |
H2(o) | 4.55(−9) | 0.00 | 0.00 | 4.55(−9) | 8 | 8/16 | |
| H(p) |
NH3(o) | → | NH(I = 2) |
H2(o) | 1.52(−9) | 0.00 | 0.00 | 1.52(−9) | 8 | 8/3/16 | |
| H(p) |
NH3(o) | → | NH(I = 2) |
H2(p) | 1.14(−9) | 0.00 | 0.00 | 1.14(−9) | 8 | 2/16 | |
| H(p) |
NH3(o) | → | NH(I = 1) |
H2(p) | 1.14(−9) | 0.00 | 0.00 | 1.14(−9) | 8 | 2/16 | |
| H(o) |
NH | → | NH(p) |
H2(o) | 1.63(−10) | 0.00 | 0.00 | 1.63(−10) | 7 | 1/8 | |
| H(o) |
NH | → | NH(o) |
H2(o) | 9.75(−10) | 0.00 | 0.00 | 9.75(−10) | 7 | 6/8 | |
| H(o) |
NH | → | NH(o) |
H2(p) | 1.63(−10) | 0.00 | 0.00 | 1.63(−10) | 7 | 1/8 | |
| H(o) |
NH2(p) | → | NH(o) |
H2(p) | 4.50(−10) | 0.00 | 0.00 | 4.50(−10) | 7 | 1/4 | |
| H(o) |
NH2(p) | → | NH(p) |
H2(o) | 9.00(−10) | 0.00 | 0.00 | 9.00(−10) | 7 | 2/4 | |
| H(o) |
NH2(p) | → | NH(o) |
H2(o) | 4.50(−10) | 0.00 | 0.00 | 4.50(−10) | 7 | 1/4 | |
| H(o) |
NH2(o) | → | NH(p) |
H2(p) | 1.20(−10) | 0.00 | 0.00 | 1.20(−10) | 7 | 4/5/12 | |
| H(o) |
NH2(o) | → | NH(p) |
H2(o) | 4.20(−10) | 0.00 | 0.00 | 4.20(−10) | 7 | 14/5/12 | |
| H(o) |
NH2(o) | → | NH(o) |
H2(p) | 1.50(−10) | 0.00 | 0.00 | 1.50(−10) | 7 | 1/12 | |
| H(o) |
NH2(o) | → | NH(o) |
H2(o) | 1.11(−9) | 0.00 | 0.00 | 1.11(−9) | 7 | 37/5/12 | |
| H(o) |
NH3(p) | → | NH(I = 1) |
H2(p) | 1.14(−9) | 0.00 | 0.00 | 1.14(−9) | 8 | 2/16 | |
| H(o) |
NH3(p) | → | NH(I = 2) |
H2(p) | 1.14(−9) | 0.00 | 0.00 | 1.14(−9) | 8 | 2/16 | |
| H(o) |
NH3(p) | → | NH(I = 0) |
H2(o) | 7.58(−10) | 0.00 | 0.00 | 7.58(−10) | 8 | 4/3/16 | |
| H(o) |
NH3(p) | → | NH(I = 1) |
H2(o) | 4.55(−9) | 0.00 | 0.00 | 4.55(−9) | 8 | 8/16 | |
| H(o) |
NH3(p) | → | NH(I = 2) |
H2(o) | 1.52(−9) | 0.00 | 0.00 | 1.52(−9) | 8 | 8/3/16 | |
| H(o) |
NH3(o) | → | NH(I = 0) |
H2(p) | 2.28(−10) | 0.00 | 0.00 | 2.28(−10) | 8 | 2/5/16 | |
| H(o) |
NH3(o) | → | NH(I = 1) |
H2(p) | 5.69(−10) | 0.00 | 0.00 | 5.69(−10) | 8 | 1/16 | |
| H(o) |
NH3(o) | → | NH(I = 2) |
H2(p) | 5.69(−10) | 0.00 | 0.00 | 5.69(−10) | 8 | 1/16 | |
| H(o) |
NH3(o) | → | NH(I = 0) |
H2(o) | 3.79(−10) | 0.00 | 0.00 | 3.79(−10) | 8 | 2/3/16 | |
| H(o) |
NH3(o) | → | NH(I = 1) |
H2(o) | 2.62(−9) | 0.00 | 0.00 | 2.62(−9) | 8 | 23/5/16 | |
| H(o) |
NH3(o) | → | NH(I = 2) |
H2(o) | 4.74(−9) | 0.00 | 0.00 | 4.74(−9) | 8 | 25/3/16 | |
| HCO+ | NH | → | NH(p) |
CO | 1.60(−10) | 0.00 | 0.00 | 1.60(−10) | 7 | 1/4 | |
| HCO+ | NH | → | NH(o) |
CO | 4.80(−10) | 0.00 | 0.00 | 4.80(−10) | 7 | 3/4 | |
| HCO+ | NH2(p) | → | NH(p) |
CO | 8.90(−10) | 0.00 | 0.00 | 8.90(−10) | 7 | 1/1 | |
| HCO+ | NH2(o) | → | NH(p) |
CO | 3.00(−10) | 0.00 | 0.00 | 3.00(−10) | 7 | 1/3 | |
| HCO+ | NH2(o) | → | NH(o) |
CO | 5.90(−10) | 0.00 | 0.00 | 5.90(−10) | 7 | 2/3 | |
| HCO+ | NH3(p) | → | NH(I = 0) |
CO | 4.80(−10) | 0.00 | 0.00 | 4.80(−10) | 6 | 1/4 | |
| HCO+ | NH3(p) | → | NH(I = 1) |
CO | 1.40(−9) | 0.00 | 0.00 | 1.40(−9) | 6 | 3/4 | |
| HCO+ | NH3(o) | → | NH(I = 1) |
CO | 7.10(−10) | 0.00 | 0.00 | 7.10(−10) | 6 | 3/8 | |
| HCO+ | NH3(o) | → | NH(I = 2) |
CO | 1.20(−9) | 0.00 | 0.00 | 1.20(−9) | 6 | 5/8 | |
| N2H+ | NH3(p) | → | NH(I = 0) |
N2 | 5.75(−10) | 0.00 | 0.00 | 5.75(−10) | 6 | 1/4 | |
| N2H+ | NH3(p) | → | NH(I = 1) |
N2 | 1.73(−9) | 0.00 | 0.00 | 1.73(−9) | 6 | 3/4 | |
| N2H+ | NH3(o) | → | NH(I = 2) |
N2 | 8.63(−10) | 0.00 | 0.00 | 8.63(−10) | 6 | 3/8 | |
| N2H+ | NH3(o) | → | NH(I = 1) |
N2 | 1.43(−9) | 0.00 | 0.00 | 1.43(−9) | 6 | 5/8 | |
|
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| H(o) |
O | → | OH+ | H2(o) | 7.98(−10) | −0.156 | 1.41 | 1.18(−9) | 9 | 1 | |
| H(o) |
O | → | H2O+ | H | 3.42(−10) | −0.156 | 1.41 | 5.05(−10) | 9 | ||
| H(p) |
O | → | OH+ | H2(o) | 3.99(−10) | −0.156 | 1.41 | 5.89(−10) | 9 | 1/2 | |
| H(p) |
O | → | OH+ | H2(p) | 3.99(−10) | −0.156 | 1.41 | 5.89(−10) | 9 | 1/2 | |
| H(p) |
O | → | H2O+ | H | 3.42(−10) | −0.156 | 1.41 | 5.05(−10) | 9 | ||
Notes. Numbers in parentheses are power of 10.
(a)
o and p stand for ortho and para states respectively. As a spherical top with four identical protons, the ammonium ion exists in three nuclear spin states noted as in Faure et al. (2013): para (I = 0), meta (I = 2), and ortho (I = 1). We note that the meta and ortho species are inverted in Rist et al. (2013).
(c)
NSBR stands for nuclear-spin branching ratio. These were combined with the overall rate coefficients taken from the cited references, e.g. Prasad & Huntress (1980). The integer ratios like e.g. 28/5/12 are normalized NSBR and stand for (28/5)/12 i.e. 28/60.
Reference. (1) Langevin rate: 2.10 × 10-9 cm3 s-1; (2) Hugo et al. (2009); (3) Honvault et al. (2011); (4) Langevin rate: 1.52 × 10-9 cm3 s-1; (5) Dislaire et al. (2012); (6) Anicich & Huntress (1986); (7) Prasad & Huntress (1980); (8) Marquette et al. (1989); (9) datasheet by Ian Smith from KIDA (Wakelam et al. 2012).
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