Relevance of the H2 + O reaction pathway for the surface formation of interstellar water - Combined experimental and modeling study

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Table 1

Calculated reaction rates for the reaction H₂ + O assuming classical and tunneled contributions.

Equation used	T	ΔE	E _a	μ	Rate
	(K)	(K)	(K)		(s^-1)

(1)k_therm.	10	960	(...)	(...)	5.2 × 10^-119
(1)k_therm.	13.5	960	(...)	(...)	3.1 × 10^-85
(4)k_endo.tunn.	10	960	2040^a	μ_eff = 0.47	5.0 × 10^-36
(4)k_endo.tunn.	13.5	960	2040^a	μ_eff = 0.47	3.2 × 10^-25
(2)k_exo.tunn.	(...)	(...)	3000¹	μ_red = 1.78	1.2 × 10^-1
(2)k_exo.tunn.	(...)	(...)	3000¹	μ_eff = 0.47	2.3 × 10^{+ 5}

Notes.

^(a)

The total barrier of the reaction is the combination of the endothermicity, ΔE, and the barrier itself, E_a, which amounts in total to ~3000 K⁽¹⁾.

Reference. .

⁽¹⁾

Baulch et al. (1992)

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