Results 261 to 270 of about 737,718 (307)

Radiation chemistry in ammonia-water ices

The Journal of Chemical Physics, 2010
We studied the effects of 100 keV proton irradiation on films of ammonia-water mixtures between 20 and 120 K. Irradiation destroys ammonia, leading to the formation and trapping of H2, N2, NO, and N2O, the formation of cavities containing radiolytic gases, and ejection of molecules by sputtering.
M J, Loeffler, U, Raut, R A, Baragiola
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Radiation chemistry of nitrate ices

Radiation Physics and Chemistry (1977), 1978
Abstract The yields of various products formed in γ-irradiated nitrate ices, viz. NO2-, H2O2, O2 and H2, have been measured at different nitrate concentrations. Daniel's method of partition of yields has been employed to evaluate the direct and indirect effect contributions to the yields of the first three products.
Kamal Kishore, P.N. Moorthy, K.N. Rao
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Ice Chemistry in Space

2003
In this chapter we review the current knowledge on ice chemistry in space. We describe the basic processes of ice formation and destruction on interstellar grains and discuss the role of icy particles as catalysts in dense molecular clouds. In the following sections we describe laboratory simulation techniques such as low temperature infrared ...
Pascale Ehrenfreund, Helen Fraser
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Physics and chemistry of water and ice

Physical Chemistry Chemical Physics, 2011
Water in its various forms is fascinating to all of us, either when walking on a glacier on high mountains, when swimming in the sea, or simply when looking at clouds. We all know that we must drink water every day, so no explanation is needed for the fact that we need water to stay alive.
Carlos, Vega, Jose Luis F, Abascal, Pablo G, Debenedetti   +2 more
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Cosmic ion induced chemistry in ices

Rendiconti Lincei, 2011
Since many years, the Laboratory for Experimental Astrophysics in Catania (Italy) has given a contribution to a number of experiments with the aim to investigate the physico-chemical effects induced by fast ions irradiating astrophysical relevant materials.
Giovanni Strazzulla, Mario Garozzo, Daniele Fulvio, Zuzana Kanuchova, Maria Elisabetta Palumbo   +4 more
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Ice cream: Delicious chemistry

Journal of Chemical Education, 1983
This chemistry lab gives practical illustration of the relation of physical properties to bond type and the solution theory. [Debut of second run of this Feature.]
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Radiation chemistry of H2O + O2 ices

Icarus, 2008
The chemistry and spectroscopy of proton-irradiated H2O + O2 ices have been investigated in relation to the production of oxidants in icy satellite surfaces. Hydrogen peroxide (H2O2), ozone (O3), and the hydroperoxy (HO2) and hydrogen trioxide (HO3) radicals have all been observed, and their temperature and dose dependent production trends have been ...
Paul D. Cooper, Marla H. Moore, Reggie L. Hudson   +2 more
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Chemistry of Deicing Roads: Penetrating Ice

Journal of Transportation Engineering, 1988
Experimental measurements of the rates at which sodium chloride, calcium chloride, urea, and calcium magnesium acetate (CMA) penetrate ice are consistent with a theory developed to predict this rate. These measurements and theory complement earlier studies of the rate at which ice can be debonded from road pavement. The mass transfer coefficients found
Susan E. Trost, Frank J. Heng, E. L. Cussler   +2 more
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Pre-Cometary Ice Composition from Hot Core Chemistry

Astrobiology, 2005
Pre-cometary ice located around star-forming regions contains molecules that are pre-biotic compounds or pre-biotic precursors. Molecular line surveys of hot cores provide information on the composition of the ice since it sublimates near these sites.
Tornow, C., Kührt, E., Motschmann, U.
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Predicting products of space ice chemistry

C&EN Global Enterprise, 2018
In the search for sources of complex organic molecules in space, some researchers have turned to hydrocarbon ices, which exist in interstellar space and on bodies in our solar system, such as Saturn’s moon Titan. Experiments have shown that high-energy electrons generated by ionizing radiation can induce formation of complex organic molecules on these ...
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