Fig. 4
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Temperature dependence of the reaction rate coefficient for the reaction NH3+ + H2 → NH4+ + H. The present data obtained using normal H2 (pentagons) and para-enriched H2 (diamonds) are compared to values measured previously in normal hydrogen (Fehsenfeld et al. 1975; Smith & Adams 1981; Luine & Dunn 1985; Böhringer & Arnold 1985; Böhringer 1985; Kim et al. 1975; Gerlich 1993; Rednyk et al. 2019), and to the theoretical predictions by Álvarez-Barcia et al. (2016); Hashimoto et al. (2023) and Zhu et al. (2025) (see legend for description of the symbols).
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