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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/28363
Title: The Genealogical Tree of Ethanol: Gas-phase Formation of Glycolaldehyde, Acetic Acid, and Formic Acid
Authors: Skouteris, Dimitrios
Balucani, Nadia
Ceccarelli, Cecilia
Vazart, Fanny
Puzzarini, Cristina
Barone, Vincenzo
CODELLA, CLAUDIO 
Lefloch, Bertrand
Issue Date: 2018
Journal: THE ASTROPHYSICAL JOURNAL 
Number: 854
Issue: 2
First Page: 135
Abstract: Despite the harsh conditions of the interstellar medium, chemistry thrives in it, especially in star-forming regions where several interstellar complex organic molecules (iCOMs) have been detected. Yet, how these species are synthesized is a mystery. The majority of current models claim that this happens on interstellar grain surfaces. Nevertheless, evidence is mounting that neutral gas-phase chemistry plays an important role. In this paper, we propose a new scheme for the gas-phase synthesis of glycolaldehyde, a species with a prebiotic potential and for which no gas-phase formation route was previously known. In the proposed scheme, the ancestor is ethanol and the glycolaldehyde sister species are acetic acid (another iCOM with unknown gas-phase formation routes) and formic acid. For the reactions of the new scheme with no available data, we have performed electronic structure and kinetics calculations deriving rate coefficients and branching ratios. Furthermore, after a careful review of the chemistry literature, we revised the available chemical networks, adding and correcting several reactions related to glycolaldehyde, acetic acid, and formic acid. The new chemical network has been used in an astrochemical model to predict the abundance of glycolaldehyde, acetic acid, and formic acid. The predicted abundance of glycolaldehyde depends on the ethanol abundance in the gas phase and is in excellent agreement with the measured one in hot corinos and shock sites. Our new model overpredicts the abundance of acetic acid and formic acid by about a factor of 10, which might imply a yet incomplete reaction network.
URI: http://hdl.handle.net/20.500.12386/28363
URL: https://iopscience.iop.org/article/10.3847/1538-4357/aaa41e
ISSN: 0004-637X
DOI: 10.3847/1538-4357/aaa41e
Bibcode ADS: 2018ApJ...854..135S
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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