English   español  
Por favor, use este identificador para citar o enlazar a este item: http://hdl.handle.net/10261/110719
Compartir / Impacto:
Estadísticas
Add this article to your Mendeley library MendeleyBASE
Citado 4 veces en Web of Knowledge®  |  Ver citas en Google académico
Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Exportar otros formatos: Exportar EndNote (RIS)Exportar EndNote (RIS)Exportar EndNote (RIS)
Título

The formation of carbamate ions in interstellar ice analogues

Autor Rodríguez Lazcano, Yamilet; Maté, Belén ; Herrero, Víctor J. ; Escribano, Rafael ; Gálvez, Óscar
Fecha de publicación 2014
EditorRoyal Society of Chemistry (Great Britain)
Citación Physical Chemistry Chemical Physics 16: 3371- 3380 (2014)
ResumenCarbon dioxide and ammonia are two of the most abundant species in astrophysical media, where they can react in the solid phase under certain conditions. This contribution presents a study of this reaction both in the presence of water and for anhydrous samples. It is shown that after deposition at 15 K, the reaction can start by warming the deposit, and the process continues on up to a temperature of 220 K. Reaction products are studied using infrared spectroscopy and mass spectrometry. For anhydrous samples, a 2:1 stoichiometry mixture of NH3:CO2 gives the highest yield of products. The reaction is favored when a small amount of water is present, which enables ammonia and carbon dioxide molecules to collide within the pores and channels of the amorphous water solid. Large concentration of water, on the other hand, hampers such collisions. The main reaction product is found to be ammonium carbamate, but also carbamic acid is formed, and, in the presence of water, ammonium bicarbonate is produced as well. Theoretical calculations are carried out to provide the basis for the assignment of the spectra. Some of the experiments presented in this contribution consist of the generation of a compact water ice matrix where the carbamate and ammonium ions are embedded. If such a system was found in astrophysical media, it is shown that the ammonium ion could not be detected, whereas two infrared features of the carbamate ion in the 1040 to 1115 cm-1 (9 to 9.6 μm) region could enable the observation of this species. © 2014 the Owner Societies.
URI http://hdl.handle.net/10261/110719
DOI10.1039/c3cp53153h
Identificadoresdoi: 10.1039/c3cp53153h
issn: 1463-9076
Aparece en las colecciones: (CFMAC-IEM) Artículos
Ficheros en este ítem:
Fichero Descripción Tamaño Formato  
accesoRestringido.pdf15,38 kBAdobe PDFVista previa
Visualizar/Abrir
Mostrar el registro completo
 



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