Gaseous products from VUV photolysis of cometary solids

Computer Science – Sound

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Comet Nuclei, Far Ultraviolet Radiation, Photolysis, Reaction Products, Solar Radiation, Space Environment Simulation, Gases, Irradiation, Organic Solids, Photodissociation, Radiation Effects

Scientific paper

Results of comet simulation experiments involving solar UV radiation and, in particular, photons with wavelengths below 200 nm are presented. A deuterium VUV source was installed in the space simulator chamber at the DLR in Cologne, Germany, to irradiate a spot on the surface of the cometary analog of the Kometen-simulation (KOSI) experiments. Laboratory experiments were carried out in a vacuum chamber with a liquid nitrogen-cooled sample holder. Mineral components of KOSI experiments and some organic macromolecules including kerogen, polyoxymethylene, and nitrogen-containing compounds were irradiated with a maximum fluence of 3.4 x 10 exp 23 photons/sq m. The gases evolved were measured with a quadrupole mass spectrometer. The experiments are of importance for photolytic processes in cometary surfaces and ejected grains and their contribution to coma composition.

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