Interstellar hydrogen bonding |
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Authors: | Emmanuel E Etim Prasanta Gorai Ankan Das Sandip K Chakrabarti Elangannan Arunan |
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Institution: | 1. Department of Chemical Sciences, Federal University Wukari, Katsina-Ala Road, P.M.B. 1020 Wukari, Taraba State, Nigeria;2. Indian Centre for Space Physics, 43 Chalantika, Garia Station Road, Kolkata 700 084, India;3. S. N. Bose National Centre for Basic Sciences, Salt Lake, Kolkata 700098, India;4. Inorganic and Physical Chemistry Department, Indian Institute of Science Bangalore, 560012, India |
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Abstract: | This paper reports the first extensive study of the existence and effects of interstellar hydrogen bonding. The reactions that occur on the surface of the interstellar dust grains are the dominant processes by which interstellar molecules are formed. Water molecules constitute about 70% of the interstellar ice. These water molecules serve as the platform for hydrogen bonding. High level quantum chemical simulations for the hydrogen bond interaction between 20 interstellar molecules (known and possible) and water are carried out using different ab-intio methods. It is evident that if the formation of these species is mainly governed by the ice phase reactions, there is a direct correlation between the binding energies of these complexes and the gas phase abundances of these interstellar molecules. Interstellar hydrogen bonding may cause lower gas abundance of the complex organic molecules (COMs) at the low temperature. From these results, ketenes whose less stable isomers that are more strongly bonded to the surface of the interstellar dust grains have been observed are proposed as suitable candidates for astronomical observations. |
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Keywords: | ISM Abundance-ISM Atoms-ISM Molecules Physical data and processes Astrochemistry |
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