Synthesis of Complex Organic Molecules in Soft X-Ray Irradiated Ices

摘要: We study the chemical evolution of H2O:CO:NH3 ice mixtures irradiated with soft X-rays, in range 250-1250 eV. identify many nitrogen-bearing molecules such as e.g., OCN-, NH4+ , HNCO, CH3CN, HCONH2, and NH2COCONH2. Several infrared features are compatible glycine or its isomers. During irradiation, we detected through mass spectroscopy species desorbing ice. Such findings support either identifications reveal less abundant not clear features. Among them, m/z = 57 has been ascribed to methyl isocyanate (CH3NCO), a molecule prebiotic relevance, recently protostellar environments. warm up after several including 2168 cm-1 band 1690 formamide, 1590 associated three different species, HCOO-, CH3NH2 NH3+CH2COO survive room temperature. Interestingly, high masses have also detected. Possible candidates methyl-formate, (m/z 60, HCOOCH3), ethanediamide 88, NH2COCONH2), N-acetyl-L-aspartic acid (m=z 175). This latter is presence 43, 70 80 fragments. Photo-desorption organics relevant for detection gas-phase cold environments, where organic synthesis mantles should dominate. estimate enrichment some selected light protoplanetary disc model around young solar-type stars.