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The abiotic formation of high-molecular-weight organics from an inorganic gas mixture of carbon monoxide, ammonia, and water as a result of 3-MeV proton irradiation from a Van de Graaff accelerator was experimentally verified. The inorganic gas mixture was simulated for representative of interstellar medium. The irradiation products included amino acid precursors and the molecular weight distribution ranged from several hundred to a maximum of 3,000. Both proteinous and non-proteinous amino acids were detected after acid-hydrolysis. Thus, the primary irradiation products were not free amino acid analogs but were amino acid precursors having high molecular weight. The present results have significant implications regarding the extraterrestrial origins of amino acid precursors, such as meteoritic organic compounds, and the organic composition of interstellar dust particles

Abiotic synthesis of high-molecular-weight organics from an inorganic gas mixture of carbon monoxide, ammonia, and water by 3 MeV proton irradiation