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Study of the chemical evolution and spectral signatures of some interstellar precursor molecules of adenine,glycine & alanine
Institution:1. Indian Centre For Space Physics, 43 Chalantika, Garia Station Road, Kolkata 700084, India;2. S.N. Bose National Center for Basic Sciences, JD-Block, Salt Lake, Kolkata 700098, India;3. Maharaja Manindra Chandra College, 20 Ramakanto Bose Street, Kolkata 700003, India;1. Institute of Molecule and Crystal Physics, Ufa Research Centre of Russian Academy of Sciences, Prospect Octyabrya, 151, Ufa, Russia;2. Ufa State Aviation Technical University, K. Marx St., 12, Ufa, Russia;1. College of Chemistry and Environmental Engineering, Yangtze University, Jingzhou 434023, China;2. School of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao 266033, China;3. School of Materials Science and Engineering, Sun Yat-sen University, Guangzhou 510275, China;1. V.P. & R.P.T.P. Science College, VallabhVidyanagar 388120, Gujarat, India;2. P.S. Science College, Kadi 382715, Gujarat, India
Abstract:We carry out a quantum chemical calculation to obtain the infrared and electronic absorption spectra of several complex molecules of the interstellar medium (ISM). These molecules are the precursors of adenine, glycine & alanine. They could be produced in the gas phase as well as in the ice phase. We carried out a hydro-chemical simulation to predict the abundances of these species in the gas as well as in the ice phase. Gas and grains are assumed to be interacting through the accretion of various species from the gas phase onto the grain surface and desorption (thermal evaporation and photo-evaporation) from the grain surface to the gas phase. Depending on the physical properties of the cloud, the calculated abundances varies. The influence of ice on vibrational frequencies of different pre-biotic molecules was obtained using Polarizable Continuum Model (PCM) model with the integral equation formalism variant (IEFPCM) as default SCRF method with a dielectric constant of 78.5. Time dependent density functional theory (TDDFT) is used to study the electronic absorption spectrum of complex molecules which are biologically important such as, formamide and precursors of adenine, alanine and glycine. We notice a significant difference between the spectra of the gas and ice phase (water ice). The ice could be mixed instead of simple water ice. We have varied the ice composition to find out the effects of solvent on the spectrum. We expect that our study could set the guidelines for observing the precursor of some bio-molecules in the interstellar space.
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