664. Wilhelm und Else Heraeus-Seminar on Prebiotic Molecules in Space and Origins of Life on Earth Contribution ID : 15 Type : Contributed Talk The ethanol tree: possible gas-phase formation routes of glycolaldehyde, acetic acid and formic acid in ISM Thursday, 22 March 2018 17:00 (15) The question of the formation of Complex Organic Molecules (COMs) in ISM is a main issue inthefield of prebiotic chemistry. More particularly, glycolaldehyde is an important species in this context, especially because it is the simplest sugar-related compound. Indeed, it is thought to be able to be converted into short dipeptides[1] or amino acids[2] and to ease the formation of more complex sugars.[3] Moreover, its key roles in ISM appear to be also remarkable since it has been detected in Sgr B2,[4] in high- and low- mass star forming regions[5] and more recently in shocked regions.[6] In this contribution it is demonstrated, using a computational strategy integrating state-of-the-art electronic structure calculations and kinetic calculations, that the reaction between two widely diffuse species, that are hydroxyethyl radicals and atomic oxygen, can easily account for the formation of, not only glycolaldehyde, but also acetic and formic acids, species that can also be of interest in both prebiotic chemistry and interstellar medium. [1] Pizzarello, S., Weber, A. L., 2004 Science 303: 1151 [2] Weber, A. L., Pizzarello, S. 2006 Proceedings of the National Academy of Sciences of the USA 103: 12713– 12717 [3] Cantillo, D., Ávalos, M., Babiano, R., Cintas, P., Jiménez, J. L., Palacios, J. C. 2012 Chem. Eur. J. 18: 8795– 8799. [4] Hollis, J. M., Lovas, F. J., Jewell, P. R. 2000, ApJ, 540, L107 [5] Beltran, M. T., Codella, C., Viti, S., Neri, R., & Cesaroni, R. 2009, ApJ, 690, L93 [6] Lefloch B., Ceccarelli C., Codella C. et al. 2017, MNRAS, 469, L73 Primary author(s) : Dr SKOUTERIS, Dimitrios (Scuola Normale Superiore di Pisa) Co-author(s) : Dr LEFLOCH, Bertrand (Université Grenoble Alpes, IPAG); CECCARELLI, Cecilia (Univer- sitè Grenoble Alpes - IPAG); Dr CODELLA, Claudio (Istituto di Radioastronomia Sezione Firenze); PUZZARINI, Cristina; VAZART, Fanny (Scuola Normale Superiore di Pisa); BALUCANI, Nadia (Università degli Studi di Peru- gia); Prof. BARONE, Vincenzo Presenter(s) : VAZART, Fanny (Scuola Normale Superiore di Pisa) Session Classification : The assembly of prebiotic molecules Track Classification : The assembly of prebiotic molecules.