0000000000424027

AUTHOR

G. M. Muñoz Caro

showing 3 related works from this author

SOFT X-RAY IRRADIATION OF PURE CARBON MONOXIDE INTERSTELLAR ICE ANALOGUES

2012

There is an increasing evidence for the existence of large organic molecules in the interstellar and circumstellar medium. Very few among such species are readily formed in conventional gas-phase chemistry under typical conditions of interstellar clouds. Attention has therefore focused on interstellar ices as a potential source of these relatively complex species. Laboratory experiments show that irradiation of interstellar ice analogues by fast particles or ultraviolet radiation can induce significant chemical complexity. However, stars are sources of intense X-rays at almost every stage of their formation and evolution. Such radiation may thus provide chemical changes in regions where ult…

PhysicsAstrophysics::High Energy Astrophysical PhenomenaInterstellar icePhotodissociationInterstellar cloudAstronomy and AstrophysicsAstrophysicsRadiationmolecules | X-rays: ISM | methods: laboratory [ISM]Starschemistry.chemical_compoundSettore FIS/05 - Astronomia E AstrofisicachemistrySpace and Planetary ScienceISM: molecules | X-rays: ISM | methods: laboratoryAstrophysics::Earth and Planetary AstrophysicsIrradiationAstrophysics::Galaxy AstrophysicsOrder of magnitudeCarbon monoxide
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Synthesis of complex organic molecules in soft x-ray irradiated ices

2019

We study the chemical evolution of H2O:CO:NH3 ice mixtures irradiated with soft X-rays, in the range 250-1250 eV. We identify many nitrogen-bearing molecules such as e.g., OCN-, NH4+ , HNCO, CH3CN, HCONH2, and NH2COCONH2. Several infrared features are compatible with glycine or its isomers. During the irradiation, we detected through mass spectroscopy many species desorbing the ice. Such findings support either the infrared identifications and reveal less abundant species with not clear infrared features. Among them, m/z = 57 has been ascribed to methyl isocyanate (CH3NCO), a molecule of prebiotic relevance, recently detected in protostellar environments. During the warm up after the irradi…

FormamidePhysicsRange (particle radiation)010504 meteorology & atmospheric sciencesInfraredAnalytical chemistryFOS: Physical sciencesAstronomy and AstrophysicsMass spectrometry01 natural sciencesAstrophysics - Astrophysics of GalaxiesStarschemistry.chemical_compoundchemistrySpace and Planetary ScienceAstrophysics of Galaxies (astro-ph.GA)0103 physical sciencesMoleculeOrganic synthesisIrradiation010303 astronomy & astrophysics0105 earth and related environmental sciences
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Soft X-Ray Irradiation of Methanol Ice: Implication for H2CO Formation in Interstellar Regions

2010

We performed 0.3 keV soft X-ray irradiation of a methanol ice at 8 K under ultra-high vacuum conditions. To the best of our knowledge, this is the first time that soft X-rays are used to study photolysis of ice analogs. Despite the low irradiation dose of 10{sup -6} photons molecule{sup -1}, the formation of formaldehyde has been observed. The results of our experiments suggest that X-rays may be a promising candidate to the formation of complex molecules in regions where UV radiation is severely inhibited.

PhysicsPhotodissociationFormaldehydeAstronomy and AstrophysicsRadiationPhotochemistryChemical reactionDecompositionchemistry.chemical_compoundISM: molecules – methods: laboratory – X-rays: ISMSettore FIS/05 - Astronomia E AstrofisicachemistrySpace and Planetary ScienceMoleculeIrradiationMethanolAtomic physics
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