Formation of Hydrogen, Oxygen, and Hydrogen Peroxide in Electron‐irradiated Crystalline Water Ice
نویسندگان
چکیده
منابع مشابه
Formation of Hydrogen, Oxygen, and Hydrogen Peroxide in Electron Irradiated Crystalline Water Ice
Water ice is abundant both astrophysically, for example in molecular clouds, and in planetary systems. The Kuiper belt objects, many satellites of the outer solar system, the nuclei of comets and some planetary rings are all known to be water-rich. Processing of water ice by energetic particles and ultraviolet photons plays an important role in astrochemistry. To explore the detailed nature of ...
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We conducted a systematic study of the irradiation of crystalline water ice in an ultrahigh vacuum chamber at pressures of about 10!10 torr. Crystalline water ices of 115 " 30 nm thickness were irradiated with energetic electrons at 12, 40, 60, and 90 K to simulate energetic particle interaction with solar system and interstellar water ices. The production rates of molecular hydrogen (H2), mole...
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We present infrared absorption studies on the effects of 50–100 keV Ar+ and 100 keV H+ ion irradiation of water ice films at 20–120 K. The results support the view that energetic ions can produce hydrogen peroxide on the surface of icy satellites and rings in the outer Solar System, and on ice mantles on interstellar grains. The ion energies are characteristic of magnetospheric ions at Jupiter,...
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The reactions of cold H atoms with solid O2 molecules were investigated at 10 K. The formation of H2O2 and H2O has been confirmed by in-situ infrared spectroscopy. We found that the reaction proceeds very efficiently and obtained the effective reaction rates. This is the first clear experimental evidence of the formation of water molecules under conditions mimicking those found in cold interste...
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The extent to which H202 dissolved in cloud droplets is trapped in rime ice affects the composition of precipitation and the rate of H202 removal from the atmosphere. Measurements were conducted in winter stratiform clouds at a remote mountain-top site in southeastern Wyoming, thus avoiding the difficulties of preparing laboratory clouds whose chemical and physical properties are similar to nat...
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ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 2006
ISSN: 0004-637X,1538-4357
DOI: 10.1086/499231