Formation rates of complex organics in UV irradiated CH3OH-rich ices I: Experiments
@article{Oberg2009FormationRO,
title={Formation rates of complex organics in UV irradiated CH3OH-rich ices I: Experiments},
author={Karin I. Oberg and Robin T. Garrod and E. F. van Dishoeck and Harold Linnartz},
journal={Astronomy and Astrophysics},
year={2009},
volume={504},
pages={891-913}
}Context. Gas-phase complex organic molecules are commonly detected in the warm inner regions of protostellar envelopes, so-called hot cores. Recent models show that photochemistry in ices followed by desorption may explain the observed abundances. There is, however, a general lack of quantitative data on UV-induced complex chemistry in ices. Aims. This study aims to experimentally quantify the UV-induced production rates of complex organics in CH3OH-rich ices under a variety of astrophysically…
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References
SHOWING 1-10 OF 76 REFERENCES
Photodesorption of ices I: CO, N₂, and CO₂
- Physics, Chemistry
- 2008
Context. A longstanding problem in astrochemistry is how molecules can be maintained in the gas phase in dense inter- and circumstellar regions at temperatures well below their thermal desorption…
An experimental study of the organic molecules produced in cometary and interstellar ice analogs by thermal formaldehyde reactions.
- Physics, ChemistryIcarus
- 1993
It is estimated that about 1% of the organics found in the coma of Comet Halley could have been produced by thermal formaldehyde reactions taking place in the nucleus.
H-atom bombardment of CO2, HCOOH, and CH3CHO containing ices
- Physics
- 2007
Context. Hydrogenation reactions are expected to be among the most important surface reactions on interstellar ices. However, solid state astrochemical l aboratory data on reactions of H-atoms with…
Mechanistical Studies on the Irradiation of Methanol in Extraterrestrial Ices
- Physics, Chemistry
- 2007
Pure ices of amorphous methanol, CH3OH(X 1A'), were irradiated at 11 K by 5 keV electrons at 100 nA for 1 hr. These energetic electrons simulate electronic energy transfer processes that occur as…
Photodesorption of water ice - A molecular dynamics study
- Physics
- 2008
Context. Absorption of ultraviolet radiation by water ice coating interstellar grains can lead to dissociation and desorption of the ice molecules. These processes are thought to be important in the…
PHOTODESORPTION OF ICES. II. H2O AND D2O
- Physics
- 2008
Gaseous H2O has been detected in several cold astrophysical environments, where the observed abundances cannot be explained by thermal desorption of H2O ice or by H2O gas-phase formation. These…
UV-photoprocessing of interstellar ice analogs: New infrared spectroscopic results
- Physics
- 2003
We simulate experimentally the physical conditions present in dense clouds by means of a high vacuum experimental setup at low temperature T ≈ 12 K. The accretion and photoprocessing of ices on grain…
Laboratory Studies of the Formation of Methanol and Other Organic Molecules by Water+Carbon Monoxide Radiolysis: Relevance to Comets, Icy Satellites, and Interstellar Ices
- Physics
- 1999
Radiation processing of cometary, planetary, and interstellar ices has been investigated by irradiating mixtures of H2O and CO near 16 K with 0.8-MeV protons. IR spectroscopy and isotopic…
PHOTODESORPTION OF CO ICE
- Physics, Chemistry
- 2007
At the high densities and low temperatures found in star forming regions, all molecules other than H2 should stick on dust grains on timescales shorter than the cloud lifetimes. Yet these clouds are…