Organic Compounds Produced by Photolysis of Realistic Interstellar and Cometary Ice Analogs Containing Methanol

摘要: The InfraRed (IR) spectra of UltraViolet (UV) and thermally processed, methanol-containing interstellar / cometary ice analogs at temperatures from 12 to 300 K are presented. Infrared spectroscopy, H-1 C-13 Nuclear Magnetic Resonance (NMR) gas chromatography-mass spectrometry indicate that CO (carbon monoxide), CO2 dioxide), CH4 (methane), HCO (the formyl radical), H2CO (formaldehyde), CH3CH2OH (ethanol), HC([double bond]O)NH2 (formamide), CH3C([double (acetamide), R[single bond]C[triple bond]N (nitriles) formed. In addition, the organic materials remaining after photolyzed have been warmed room temperature contain (in rough order decreasing abundance), (1) hexamethylenetetramine (HMT, C6H12N4), (2) ethers, alcohols, compounds related PolyOxyMethylene (POM, ([single bond]CH2O[single bond](sub n)), (3) ketones (R[single bond]C([double bond]O)[single bond]R') amides (H2NC([double bond]R). Most carbon in these residues is thought come methanol original ice. Deuterium isotopic labeling demonstrates definitely source HMT. High concentrations HMT ices could important astrophysical consequences. ultraviolet photolysis frozen H2O readily produces 'XCN' band observed protostellar objects laboratory ices, as well other nitriles. Thus, may be a precursor XCN CN comets medium. Also, known hydrolyze under acidic conditions yield ammonia, formaldehyde, amino acids. significant prebiogenic on asteroidal parent bodies. A potential mechanism for radiative formation cosmic outlined.