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April 2, 2026

Ammonia deuteration mechanism in interstellar conditions. Ion trap study of D3+ + NH3 reaction

O. E. Hernández Alvarez D. Rednyk Š. Roučka I. Bondari S. Soboli P. Dohnal R. Plašil J. Glosík

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Key Points

The research aims to understand the mechanism of deuterium transfer in the D3+ + NH3 reaction under interstellar conditions.
Conducted experiments using a cryogenic 22-pole radiofrequency ion trap
Measured reaction rate coefficients and product branching fractions between 110 and 300 K
Stored ions in helium buffer gas at controlled number densities
Reaction rate coefficients decreased from 5.4 x 10^-9 cm^3/s at 149 K to 3.9 x 10^-9 cm^3/s at 293 K
The D3+ + NH3 reaction shows a systematic isotope effect, reacting slightly more slowly than H3+ + NH3
Product branching fractions indicate a predominance of ammonia deuterated isotopologs with over 99.5% at low temperatures

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Implication

Investigates deuterium transfer mechanisms in ammonia, suggesting proton hop dominates in interstellar environments.

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Cite This Study

Alvarez et al. (2026) studied this question.

synapsesocial.com/papers/69e3201440886becb653f3b7 https://doi.org/10.1051/0004-6361/202659362/pdf

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