Biology – Quantitative Biology – Biomolecules
Scientific paper
Feb 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003icar..161..486m&link_type=abstract
Icarus, Volume 161, Issue 2, p. 486-500.
Biology
Quantitative Biology
Biomolecules
43
Scientific paper
Infrared spectra and radiation chemical behavior of N2-dominated ices relevant to the surfaces of Triton and Pluto are presented. This is the first systematic IR study of proton-irradiated N2-rich ices containing CH4 and CO. Experiments at 12 K show that HCN, HNC, and diazomethane (CH2N2) form in the solid phase, along with several radicals. NH3 is also identified in irradiated N2 + CH4 and N2 + CH4 + CO. We show that HCN and HNC are made in irradiated binary ice mixtures having initial N2/CH4 ratios from 100 to 4, and in three-component mixtures have an initial N2/(CH4 + CO) ratio of 50. HCN and HNC are not detected in N2-dominated ices when CH4 is replaced with C2H6, C2H2, or CH3OH.
The intrinsic band strengths of HCN and HNC are measured and used to calculate G(HCN) and G(HNC) in irradiated N2 + CH4 and N2 + CH4 + CO ices. In addition, the HNC/HCN ratio is calculated to be ~1 in both icy mixtures. These radiolysis results reveal, for the first time, solid-phase synthesis of both HCN and HNC in N2-rich ices containing CH4.
We examine the evolution of spectral features due to acid-base reactions (acids such as HCN, HNC, and HNCO and a base, NH3) triggered by warming irradiated ices from 12 K to 30-35 K. We identify anions (OCN-, CN-, and N3-) in ices warmed to 35 K. These ions are expected to form and survive on the surfaces of Triton and Pluto. Our results have astrobiological implications since many of these products (HCN, HNC, HNCO, NH3, NH4OCN, and NH4CN) are involved in the syntheses of biomolecules such as amino acids and polypeptides.
Hudson Reggie L.
Moore Marla H.
No associations
LandOfFree
Infrared study of ion-irradiated N2-dominated ices relevant to Triton and Pluto: formation of HCN and HNC does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Infrared study of ion-irradiated N2-dominated ices relevant to Triton and Pluto: formation of HCN and HNC, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Infrared study of ion-irradiated N2-dominated ices relevant to Triton and Pluto: formation of HCN and HNC will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-923109