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• W75348637 abstract "Abstract Infrared observations, combined with realistic laboratory simulations, have revolutionized our understanding of interstellar ice and dust, the building blocks of comets. Since comets are thought to be a major source of the volatiles on the primative earth, their organic inventory is of central importance to questions concerning the origin of life. Ices in molecular clouds contain the very simple molecules H 2 O, CH 3 OH, CO, CO 2 , CH 4 , H 2 , and probably some NH 3 and H 2 CO, as well as more complex species including nitriles, ketones, and esters. The evidence for these, as well as carbonrich materials such as polycyclic aromatic hydrocarbons (PAHs), microdiamonds, and amorphous carbon is briefly reviewed. This is followed by a detailed summary of interstellar/precometary ice photochemical evolution based on laboratory studies of realistic polar ice analogs. Ultraviolet photolysis of these ices produces H 2 , H 2 CO, CO 2 , CO, CH 4 , HCO, and the moderately complex organic molecules: CH 3 CH 2 OH (ethanol), HC(= O)NH 2 (formamide), CH 3 C(= O)NH 2 (acetamide), R-CN (nitriles), and hexamethylenetetramine (HMT, C 6 H 12 N 4 ), as well as more complex species including polyoxymethylene and related species (POMs), amides, and ketones. The ready formation of these organic species from simple starting mixtures, the ice chemistry that ensues when these ices are mildly warmed, plus the observation that the more complex refractory photoproducts show lipid-like behavior and readily self organize into droplets upon exposure to liquid water suggest that comets may have played an important role in the origin of life." @default.
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• W75348637 date "1997-01-01" @default.
• W75348637 modified "2023-09-27" @default.
• W75348637 title "Photochemical Evolution of Interstellar/Precometary Organic Material" @default.
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• W75348637 doi "https://doi.org/10.1017/s0252921100014585" @default.
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