Aeronomy of the upper atmosphere of KELT-9 b | Astronomy & Astrophysics (A&A)

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Table C.1

Reactions for the negative hydrogen ion.

Reaction	Rate	Reference
e+H I⁻ → e + e + H I	T exp (−17.23 − 0.87/T)	Janev et al. (1987)

e + e + H I→ e+ H I⁻		from LTE^(a)

e + H I → hν + H I⁻	2.5 × 10⁻¹⁵ $\sqrt{T}$ $\sqrt{T}$	Stancil & Dalgarno (1998)

hν + H I⁻ → e + H I	∼10⁻¹⁷	Bell & Kingston (1967)

H I + H I⁻ → e + H I + H I	T exp (−24.9 − 0.87/T)	Janev et al. (1987)

e + H I + H I → H I + H I⁻		from LTE

p + H I⁻ → H I (n = 3) + H I	3 × 10⁻⁹ $\sqrt{T}$ $\sqrt{T}$	Janev et al. (1987)

H I(n = 2) + H I → p + H I⁻		from LTE

Notes. List of reactions of formation and destruction of the negative hydrogen ion calculated in the model. Units are in CGS. Temperature is in 10⁴ K.

^(a)Calculated from the reverse reaction using LTE relations. The density of H I⁻in LTE is given by n(H I⁻) = n(H I) n_e T^−1.5 exp (−50.66 + 0.87/T)

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