SIMBAD references

2011ApJ...729...68K - Astrophys. J., 729, 68 (2011/March-1)

On the formation of amines (RNH2) and the cyanide anion (CN) in electron-irradiated ammonia-hydrocarbon interstellar model ices.


Abstract (from CDS):

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 (Cn 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.

Abstract Copyright:

Journal keyword(s): astrobiology - astrochemistry - cosmic rays - ISM: individual: Sagittarius B2 - ISM: molecules - methods: laboratory

Simbad objects: 3

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