Laboratory simulation of the photoprocessing and warm-up of cometary and pre-cometary ices: Production of complex organic molecules

Details Laboratory simulation of the photoprocessing and warm-up of cometary and pre-cometary ices: Production of complex organic molecules Laboratory simulation of the photoprocessing and warm-up of cometary and pre-cometary ices: Production of complex organic molecules

Oct 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991ceol.symp..116s&link_type=abstract

In NASA, Washington, Fourth Symposium on Chemical Evolution and the Origin and Evolution of Life p 116 (SEE N92-13588 04-55)

Computer Science

Comets, Ice, Interstellar Chemistry, Interstellar Matter, Organic Materials, Photolysis, Simulation, Ammonia, Carbon Monoxide, Halley'S Comet, Interstellar Gas, Methyl Alcohol, Nebulae, Ultraviolet Radiation, Vapor Phases

Scientific paper

The recent missions to Comet Halley detected large quantities of organic material on grains as well as organic molecules in the gas phase. A possible origin of these materials is the energetic processing of ice mantles on the grains prior to comet formation, either in the pre-solar nebula or the interstellar medium. This process was simulated in the laboratory by depositing interstellar ice analogs (H2O/CH3OH/CO/NH3) on a cold (10 K) substrate with simultaneous UV irradiation. The material evaporating during warm-up of the photolyzed ice as well as the residue remaining at room temperature was analyzed by a number of techniques. It was found that a large number of organic molecules of various complexity are synthesized during the simulation process, stressing the possible significance of UV photolysis for producing the organic Comet material.

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