Academic Journal
Direct D-atom Incorporation in Radicals: An Overlooked Pathway for Deuterium Fractionation
| العنوان: | Direct D-atom Incorporation in Radicals: An Overlooked Pathway for Deuterium Fractionation |
|---|---|
| المؤلفون: | Nureshan Dias, Ranil M. Gurusinghe, Bernadette M. Broderick, Tom J Millar, Arthur G. Suits |
| المصدر: | The Astrophysical Journal, Vol 944, Iss 1, p 77 (2023) |
| بيانات النشر: | IOP Publishing |
| سنة النشر: | 2023 |
| المجموعة: | Directory of Open Access Journals: DOAJ Articles |
| مصطلحات موضوعية: | Astrochemistry, Chemical abundances, Isotopic abundances, Astrophysics, QB460-466 |
| الوصف: | Direct D-H exchange in radicals is investigated in a quasi-uniform flow employing chirped-pulse millimeter-wave spectroscopy. Inspired by the H-atom catalyzed isomerization of C _3 H _2 reported in our previous study, D-atom reactions with the propargyl (C _3 H _3 ) radical and its photoproducts were investigated. We observed very efficient D-atom enrichment in the photoproducts through an analogous process of D addition/H elimination to C _3 H _2 isomers occurring at 40 K or below. Cyclic C _3 HD is the only deuterated isomer observed, consistent with the expected addition/elimination yielding the lowest energy product. The other expected addition/elimination product, deuterated propargyl, is not directly detected, although its presence is inferred by the observations in the latter part of the flow. There, in the high-density region of the flow, we observed both isotopomers of singly deuterated propyne attributed to stabilization of the H+C _3 H _2 D or D+C _3 H _3 adducts. The implications of these observations for the deuterium fractionation of hydrocarbon radicals in astrochemical environments is discussed with the support of a monodeuterated chemical kinetic model. |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | English |
| تدمد: | 1538-4357 |
| Relation: | https://doi.org/10.3847/1538-4357/acac1d; https://doaj.org/toc/1538-4357; https://doaj.org/article/6bf764c851d74c29bb3494b4f26005e0 |
| DOI: | 10.3847/1538-4357/acac1d |
| الاتاحة: | https://doi.org/10.3847/1538-4357/acac1d https://doaj.org/article/6bf764c851d74c29bb3494b4f26005e0 |
| رقم الانضمام: | edsbas.AD008D1A |
| قاعدة البيانات: | BASE |
Full Text Finder | تدمد: | 15384357 |
|---|---|
| DOI: | 10.3847/1538-4357/acac1d |