Measurements and simulations of rate coefficients for the deuterated forms of the H2 + + H2 and H3 + + H2 reactive systems at low temperature
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| Format: | Preprint |
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2024
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| _version_ | 1866910725397544960 |
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| author | Jiménez-Redondo, Miguel Sipilä, Olli Jusko, Pavol Caselli, Paola |
| author_facet | Jiménez-Redondo, Miguel Sipilä, Olli Jusko, Pavol Caselli, Paola |
| contents | The rate coefficients of various isotopic variations of the H2+ + H2 and H3+ + H2 reactions in the 10-250 K temperature range were measured using a cryogenic 22 pole radio frequency ion trap. The processes involving diatomic ions were found to behave close to the Langevin rate, whereas temperature-dependent rate coefficients were obtained for the four isotopic exchange processes with triatomic ions. Fitting the experimental data using a chemical code allowed us in specific cases to constrain rate coefficients that were not directly measured in the ion trap. The reported rate coefficients suggest a more efficient hydrogenation of deuterated H3+ forms than usually assumed in astrochemical models, which might affect deuteration rates in warmer environments. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2412_02206 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Measurements and simulations of rate coefficients for the deuterated forms of the H2 + + H2 and H3 + + H2 reactive systems at low temperature Jiménez-Redondo, Miguel Sipilä, Olli Jusko, Pavol Caselli, Paola Solar and Stellar Astrophysics Astrophysics of Galaxies Nuclear Experiment Atomic Physics Chemical Physics The rate coefficients of various isotopic variations of the H2+ + H2 and H3+ + H2 reactions in the 10-250 K temperature range were measured using a cryogenic 22 pole radio frequency ion trap. The processes involving diatomic ions were found to behave close to the Langevin rate, whereas temperature-dependent rate coefficients were obtained for the four isotopic exchange processes with triatomic ions. Fitting the experimental data using a chemical code allowed us in specific cases to constrain rate coefficients that were not directly measured in the ion trap. The reported rate coefficients suggest a more efficient hydrogenation of deuterated H3+ forms than usually assumed in astrochemical models, which might affect deuteration rates in warmer environments. |
| title | Measurements and simulations of rate coefficients for the deuterated forms of the H2 + + H2 and H3 + + H2 reactive systems at low temperature |
| topic | Solar and Stellar Astrophysics Astrophysics of Galaxies Nuclear Experiment Atomic Physics Chemical Physics |
| url | https://arxiv.org/abs/2412.02206 |