On the Formation of Amines (RNH2) and the Cyanide Anion (CN-) in Electron-irradiated Ammonia-hydrocarbon Interstellar Model Ices

Details On the Formation of Amines (RNH2) and the Cyanide Anion (CN-) in Electron-irradiated Ammonia-hydrocarbon Interstellar Model Ices On the Formation of Amines (RNH2) and the Cyanide Anion (CN-) in Electron-irradiated Ammonia-hydrocarbon Interstellar Model Ices

Mar 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011apj...729...68k&link_type=abstract

The Astrophysical Journal, Volume 729, Issue 1, article id. 68 (2011).

Biology

Astrobiology, Astrochemistry, Cosmic Rays, Ism: Individual Objects: Sagittarius B2, Ism: Molecules, Methods: Laboratory

Scientific paper

The present laboratory study simulated cosmic-ray-induced grain chemistry of nitrogen-bearing organic molecules in interstellar and cometary ices. Model ices of ammonia (NH3)-methane (CH4) were prepared and irradiated at 10 K under contamination-free, ultrahigh vacuum conditions with energetic electrons generated in the track of galactic cosmic-ray particles. The radiolysis-induced processing of nitrogen-bearing molecules was then monitored on line and in situ by a Fourier transform infrared spectrometer and a quadrupole mass spectrometer during the irradiation phase and subsequent warm-up phases. The analogous processing was also achieved in ammonia (NH3) and six hydrocarbon (C n H2n+2; n = 1-6) ices. The formation of cyanide anion (CN-) was commonly observed in both ices at 10 K, the temporal column density fit of which traced back the involvement of methylamine (CH3NH2)-based intermediates. Traces of CH3NH2 were evident at about 110 K through thin ammonia matrices in sublimation. From the point of radiative transfer, we further constrain the formation mechanism of aminoacetonitrile (NH2CH2CN) on icy grains of Sgr B2(N) under a cosmic-ray-induced photon field.

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