Formation of Acetamide in Interstellar Medium

Authors: L. Foo, A. Surànyi, A. Guljas, M. Szőri, J. J. Villar, B. Viskolcz, I. G. Csizmadia, A. Rágyanszki, B. Fiser Acetamide (C2H5NO) is the largest molecule containing a peptide bond, which is an amine (-NH2) group bonded to a carbonyl (C = O) group, that has yet been detected in interstellar medium (ISM). It is also considered to be…

Cyanoacetylene in Prebiotic Synthesis

Authors: R. A. Sanchez, J. P. Ferris, L. E. Orgel Cyanoacetylene is a major nitrogen-containing product of the action of an electric discharge on a mixture of methane and nitrogen. It reacts with simple inorganic substances in aqueous solution to give products including aspartic acid, asparagine, and cytosine. 10.1126/science.154.3750.784

Vertical Distribution of Titan’s Atmospheric Neutral Constituents

Authors: L. M. Lara The vertical distribution of Titan’s neutral atmosphere compounds is calculated from a new photochemical model extending from 40 to 1432 km. This model makes use of many updated reaction rates, and of the new scheme for methane photolysis proposed by Mordauntet al. [1993].The model also includes a realistic treatment of the dissociation of N2, of the…

Radiolysis of Aqueous Solutions of Ammonium Bicarbonate Over A Large Dose Range

Authors: Z. D. Draganić , A. Negrón-Mendoza, K. Sehested, S.I. Vujošević, R. Navarro-Gonzáles, M. G. Albarrán-Sanchez, I. G. Draganić Oxygen-free aqueous solutions of 0.05 mol dm^(-3) ammonium and sodium bicarbonate were studied after receiving various doses of 60Co gammas (0.01-400kGy) or 0.5-20Gy pulses of 10Mev electrons. Formate and oxalate were found to be the main radiolytic products, in addition to…

The Radiolysis of Acetic Acid in Aqueous Solutions and Acetic Acid-Water Mixtures

Authors: Lj. Josimović , I. Draganić The radiation chemical yields of stable products were measured in deaerated and oxygenated solutions at low absorbed doses(~<10 krad), different pH values(1-3 and 7.8) and various acetic acid concentrations(0’1-17mol dm-a). For a dilute solution(0″1mol dm-a) the results obtained support a simple reactions cheme.At larger acetic acid concentrations yields of stable products change proportionally to…

Photochemistry of Methane and the Formation of Hydrocyanic Acid (HCN) in the Earth’s Early Atmosphere

The photochemistries of methane and HCN are discussed in the context of the primitive terrestrial atmosphere,using a detailed numerical model. In the absenceof abundant O2, absorption of solar EUV (λ < 1023Å) by N2 provides a large thermosphersic source of atomic nitrogen. Methane is oxidized cleanly and efficiently,provided CO2 is more abundant than CH,•. Otherwise,a large fraction of the methane…