Descripción del proyecto
En busca del precursor de la glicina interestelar en nuestro cosmos mediante la química del carbono
Las moléculas orgánicas abundan en el medio interestelar (MIS) y en otros lugares de nuestro universo. Una mejor comprensión de su origen y evolución, así como de su recorrido desde las nubes moleculares hasta la Tierra, aportaría información sobre la aparición de la vida en nuestro planeta y puede que en otros. La metilamina, CH3NH2, es la amina más simple y se considera el precursor de la glicina interestelar, uno de los veintidós aminoácidos que forman nuestras proteínas. El proyecto financiado con fondos europeos CP-FTmmW Aminogen caracteriza la estructura molecular y las propiedades químicas de dos productos intermedios obtenidos a partir de la extracción de átomos de hidrógeno de CH3NH2 mediante la luz ultravioleta o la oxidación. Aunque estos procesos son habituales en el MIS y en la atmósfera terrestre, no se ha observado directamente ni descubierto ninguno de los dos productos en dicho medio. Las mediciones ayudarán a los científicos a buscar su existencia en el MIS.
Objetivo
To elucidate our understanding of amine chemistry in the interstellar medium (ISM), we propose a two-year project to study the physical and chemical properties of CH3NH and CH2NH2, the two simplest substituted aminogen radicals, using the state-of-the-art chirped pulse Fourier transform (sub)millimeter rotational spectroscopy. Amines are important N-bearing molecules in the ISM and planetary atmospheres, as well as a trace molecule released to the Earth's atmosphere via various human activities. The simplest prime amine, CH3NH2, is proposed to be the precursors of interstellar glycine, the simplest amino acid. The physical and chemical properties of CH3NH and CH2NH2, however, are far from well understood. CH3NH and CH2NH2 are the intermediate products formed during the H-abstraction of CH3NH2 by UV photolysis or oxidation, which are important processes both in the ISM and in the Earth's atmosphere.
These two radicals, however, are not directly observed in the H-abstraction process, neither have they been discovered in the ISM. Direct measurement of these radicals via rotational spectroscopy will provide us with detailed information about their molecular structure and chemical properties, which can be further used to search for their existence in the ISM, to study the reaction dynamics of H-abstraction of CH3NH2, and to determining their molecular structure and internal motions. The results will improve our understanding of the role of CH3NH2 in the chemistry of N-bearing molecules in the ISM and in planetary atmospheres. In this proposal, we will elaborate the approach and the implementation of the objective of the direct measurement of CH3NH and CH2NH2. Support information about the researcher, the supervisor, and the host institution is also provided.
Ámbito científico
Programa(s)
Régimen de financiación
MSCA-IF - Marie Skłodowska-Curie Individual Fellowships (IF)Coordinador
59000 Lille
Francia