Cinética en fase gas de CH 3 CHO con radicales OH entre 11,7 y 177,5 K
Gas-phase reactions in the interstellar medium (ISM) are a source of molecules in this environment. The knowledge of the rate coefficient for neutral–neutral reactions as a function of temperature, k(T), is essential to improve astrochemical models. In this work, we have experimentally measured k(T)...
| Autores: | , , , , , , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2020 |
| País: | España |
| Institución: | Universidad de Castilla-La Mancha |
| Repositorio: | RUIdeRA. Repositorio Institucional de la UCLM |
| OAI Identifier: | oai:ruidera.uclm.es:10578/29672 |
| Acceso en línea: | http://hdl.handle.net/10578/29672 |
| Access Level: | acceso abierto |
| Palabra clave: | Cinética en fase gas de CH 3 CHO Radicales OH Reacciones en fase gaseosa Medio interestelar ISM Gas-phase kinetics of CH3CHO OH radicals Gas-phase reactions Interstellar medium |
| Sumario: | Gas-phase reactions in the interstellar medium (ISM) are a source of molecules in this environment. The knowledge of the rate coefficient for neutral–neutral reactions as a function of temperature, k(T), is essential to improve astrochemical models. In this work, we have experimentally measured k(T) for the reaction between the OH radical and acetaldehyde, both present in many sources of the ISM. Laser techniques coupled to a CRESU system were used to perform the kinetic measurements. The obtained modified Arrhenius equation is k(T = 11.7–177.5 K) = (1.2 ± 0.2) × 10−11 (T/300 K)−(1.8±0.1) exp–{(28.7 ± 2.5)/T} cm3 molecule−1 s−1. The k(T) value of the title reaction has been measured for the first time below 60 K. No pressure dependence of k(T) was observed at ca. 21, 50, 64 and 106 K. Finally, a pure gas-phase model indicates that the title reaction could become the main CH3CO formation pathway in dark molecular clouds, assuming that CH3CO is the main reaction product at 10 K. |
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