English   español  
Por favor, use este identificador para citar o enlazar a este item: http://hdl.handle.net/10261/129855
logo share SHARE logo core CORE   Add this article to your Mendeley library MendeleyBASE

Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Exportar a otros formatos:

Stability of Extraterrestrial Glycine under Energetic Particle Radiation Estimated from 2 keV Electron Bombardment Experiments

AutorMaté, Belén ; Tanarro, Isabel ; Escribano, Rafael ; Moreno, Miguel Ángel ; Herrero, Víctor J.
Palabras claveAstrochemistry
Techniques: spectroscopic
Methods: laboratory: molecular
ISM: general
Fecha de publicación2015
EditorUniversity of Chicago Press
CitaciónAstrophysical Journal 806: 151 (2015)
Resumen© 2015. The American Astronomical Society. All rights reserved. The destruction of solid glycine under irradiation with 2 keV electrons has been investigated by means of IR spectroscopy. Destruction cross sections, radiolysis yields, and half-life doses were determined for samples at 20, 40, 90, and 300 K. The thickness of the irradiated samples was kept below the estimated penetration depth of the electrons. No significant differences were obtained in the experiments below 90 K, but the destruction cross section at 300 K was larger by a factor of 2. The radiolysis yields and half-life doses are in good accordance with recent MeV proton experiments, which confirms that electrons in the keV range can be used to simulate the effects of cosmic rays if the whole sample is effectively irradiated. In the low temperature experiments, electron irradiation leads to the formation of residues. IR absorptions of these residues are assigned to the presence CO<inf>2</inf>, CO, OCN<sup>-</sup>, and CN<sup>-</sup> and possibly to amide bands I to III. The protection of glycine by water ice is also studied. A water ice film of ~150 nm is found to provide efficient shielding against the bombardment of 2 keV electrons. The results of this study show also that current Monte Carlo predictions provide a good global description of electron penetration depths. The lifetimes estimated in this work for various environments ranging from the diffuse interstellar medium to the inner solar system, show that the survival of hypothetical primeval glycine from the solar nebula in present solar system bodies is not very likely.
Descripción10 pags.; 6 figs.; 4 tabs.
Versión del editorhttp://dx.doi.org/10.1088/0004-637X/806/2/151
Identificadoresdoi: 10.1088/0004-637X/806/2/151
issn: 1538-4357
Aparece en las colecciones: (CFMAC-IEM) Artículos
Ficheros en este ítem:
Fichero Descripción Tamaño Formato  
Stability.pdf691,74 kBAdobe PDFVista previa
Mostrar el registro completo

Artículos relacionados:

NOTA: Los ítems de Digital.CSIC están protegidos por copyright, con todos los derechos reservados, a menos que se indique lo contrario.