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CHEMICAL PROCESSING OF PURE AMMONIA AND AMMONIA-WATER ICES INDUCED BY HEAVY IONS

Bordalo, V ; da Silveira, E F ; Lv, X Y ; DOMARACKA, A ; ROTHARD, H ; DUARTE, E SEPERUELO ; BODUCH, P

The Astrophysical journal, 2013-09, Vol.774 (2), p.1-13 [Periódico revisado por pares]

United States: American Astronomical Society

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  • Título:
    CHEMICAL PROCESSING OF PURE AMMONIA AND AMMONIA-WATER ICES INDUCED BY HEAVY IONS
  • Autor: Bordalo, V ; da Silveira, E F ; Lv, X Y ; DOMARACKA, A ; ROTHARD, H ; DUARTE, E SEPERUELO ; BODUCH, P
  • Assuntos: AMMONIA ; Astrophysics ; Clouds ; CONCENTRATION RATIO ; COSMIC RADIATION ; CROSS SECTIONS ; Destruction ; DUSTS ; FOURIER TRANSFORM SPECTROMETERS ; FREEZING OUT ; GANIL CYCLOTRON ; INFRARED SPECTRA ; INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY ; ION BEAMS ; IRRADIATION ; ISOMERS ; MOLECULES ; Monitors ; NITROGEN ; NITROGEN DIOXIDE ; NITROUS OXIDE ; Nitrous oxides ; Physics ; RADIOLYSIS ; SPECTRAL SHIFT ; STOPPING POWER ; WATER ; ZINC IONS
  • É parte de: The Astrophysical journal, 2013-09, Vol.774 (2), p.1-13
  • Notas: ObjectType-Article-1
    SourceType-Scholarly Journals-1
    ObjectType-Feature-2
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  • Descrição: Cosmic rays are possibly the main agents to prevent the freeze-out of molecules onto grain surfaces in cold dense clouds. Ammonia (NH sub(3)) is one of the most abundant molecules present in dust ice mantles, with a concentration of up to 15% relative to water (H sub(2)O). FTIR spectroscopy is used to monitor pure NH sub(3) and NH sub(3)-H sub(2)O ice samples as they are irradiated with Ni and Zn ion beams (500-600 MeV) at GANIL/France. New species, such as hydrazine (N sub(2)H sub(4)), diazene (N sub(2)H sub(2) isomers), molecular hydrogen (H sub(2)), and nitrogen (N sub(2)) were identified after irradiation of pure NH sub(3) ices. Nitrous oxide (N sub(2)O), nitrogen oxide (NO), nitrogen dioxide (NO sub(2)), and hydroxylamine (NH sub(2)OH) are some of the products of the NH sub(3)-H sub(2)O ice radiolysis. The spectral band at 6.85 mu m was observed after irradiation of both types of ice. Besides the likely contribution of ammonium (NH sub(4)) and amino (NH sub(2)) radicals, data suggest a small contribution of NH sub(2)OH to this band profile after high fluences of irradiation of NH sub(3)-H sub(2)O ices. The spectral shift of the NH sub(3) "umbrella" mode (9.3 mu m) band is parameterized as a function of NH sub(3)/H sub(2)O ratio in amorphous ices. Ammonia and water destruction cross-sections are obtained, as well as the rate of NH sub(3)-H sub(2)O (1:10) ice compaction, measured by the OH dangling bond destruction cross-section. Ammonia destruction is enhanced in the presence of H sub(2)O in the ice and a power law relationship between stopping power and NH sub(3) destruction cross-section is verified. Such results may provide relevant information for the evolution of molecular species in dense molecular clouds.
  • Editor: United States: American Astronomical Society
  • Idioma: Inglês
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