Modeling helium in exoplanet atmospheres. A revised network with photoelectron-driven processes

Open Access

Table A.5

Rate coefficients [cm³s⁻¹] at selected temperatures for loss processes of metastable He in collisions with neutrals.

	T [K]
Channel	500	2,000	5,000	10,000	Ref.
He(2³S)+H→He(1¹S)+H⁺+e⁻, HeH⁺+e⁻	1.02E−09	1.32E−09	1.35E−09	1.27E−09	Movre & Meyer (1997)
He(2¹S)+H→He(1¹S)+H⁺+e⁻, HeH⁺+e⁻	2.54E−09	2.89E−09	2.95E−09	2.96E−09	Movre et al. (1994)
$H e (2^{3} S) + H_{2} \to H e (1^{1} S) + H_{2}^{+} + e^{-}, H + {H e H}^{+} + e^{-}$ $\[\mathrm{He}\left(2^{3} \mathrm{~S}\right)+\mathrm{H}_{2} \rightarrow \mathrm{He}\left(1^{1} \mathrm{~S}\right)+\mathrm{H}_{2}^{+}+\mathrm{e}^{-}, \mathrm{H}+\mathrm{HeH}^{+}+\mathrm{e}^{-}\]$	8.94E−11	6.48E−10	1.48E−09	2.54E−09	Cohen & Lane (1977)
$H e (2^{1} S) + H_{2} \to H e (1^{1} S) + H_{2}^{+} + e^{-}, H + {H e H}^{+} + e^{-}$ $\[\mathrm{He}\left(2^{1} \mathrm{~S}\right)+\mathrm{H}_{2} \rightarrow \mathrm{He}\left(1^{1} \mathrm{~S}\right)+\mathrm{H}_{2}^{+}+\mathrm{e}^{-}, \mathrm{H}+\mathrm{HeH}^{+}+\mathrm{e}^{-}\]$	1.50E−10	9.44E−10	1.85E−09	2.79E−09	Cohen & Lane (1977)
He(2¹S)+He→He+He+hν	6.52E−15	1.56E−14	1.95E−14	2.16E−14	Zygelman (1991)

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