Diffusion measurements of CO, HNCO, H2CO, and NH3in amorphous water ice
نویسندگان
چکیده
منابع مشابه
Adsorption of CO on amorphous water-ice surfaces
We present the results of classical trajectory calculations of the adsorption of thermal CO on the surface of compact amorphous water ice, with a view to understanding the processes governing the growth and destruction of icy mantles on dust grains in the interstellar medium and interpreting solid CO infrared spectra. The calculations are performed at normal incidence, for Ei = 0.01 eV (116 K) ...
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The long-timescale behavior of adsorbed carbon monoxide on the surface of amorphous water ice is studied under dense cloud conditions by means of off-lattice, on-the-fly, kinetic Monte Carlo simulations. It is found that the CO mobility is strongly influenced by the morphology of the ice substrate. Nanopores on the surface provide strong binding sites which can effectively immobilize the adsorb...
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We present Submillimeter Array observations of H2CO and N2H + emission in the disks around the T Tauri star TW Hya and the Herbig Ae star HD 163296 at 2–6 resolution and discuss the distribution of these species with respect to CO freeze-out. The H2CO and N2H + emission toward HD 163296 does not peak at the continuum emission center that marks the stellar position but is instead significantly o...
متن کاملthe CO, HCN, H2O and H2CO molecules.
Detailed semi-empirical interaction potential calculations are performed to determine the potential energy surface experienced by the molecules CO, HCN, H2O and H2CO, when adsorbed on the basal plane (0001) of graphite at low temperature. The potential energy surface is used to find the equilibrium site and configuration of a molecule on the surface and its corresponding adsorption energy. The ...
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Electron diffraction studies of vapor-deposited water ice have characterized the dynamical structural changes during crystallization that affect volatile retention in cometary materials. Crystallization is found to occur by nucleation of small domains, while leaving a significant part of the amorphous material in a slightly more relaxed amorphous state that coexists metastably with cubic cryst...
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2013
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361/201220691