Abstract
Silicon sulfide, SiS, has been recently detected in a shocked region around a Sun-like protostar (L1157-B1) with an anomalously high abundance with respect to the more common SiO. This has challenged our comprehension of silicon chemistry in the interstellar medium. In this paper, the reaction H+SiS2 has been computationally investigated by means of electronic structure and kinetic calculations to establish its role in the conversion of interstellar SiS2 into SiS by the abundant H atoms. The calculated reaction rate coefficients between 70–100 K are high enough to conclude that SiS2 cannot be considered a reservoir species of silicon or sulphur in interstellar objects and that, if formed, SiS2 is rapidly converted into SiS+HS by the reaction with atomic hydrogen.
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Acknowledgments
DS wishes to thank the Italian Ministero dell’Istruzione, Università e Ricerca (MIUR_FFABR17_SKOUTERIS) and the Scuola Normale Superiore (SNS_RB_SKOUTERIS) for financial support. N. F-L acknowledges financial support from Fondazione Cassa di Risparmio di Perugia (P2014/1255, ACT2014/6167). This work has been supported by the project PRIN-INAF 2016 The Cradle of Life - GENESIS-SKA (General Conditions in Early Planetary Systems for the rise of life with SKA). This project has received funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme, for the Project “The Dawn of Organic Chemistry” (DCO), grant agreement No 741002. This work has also been supported by MIUR “PRIN 2015” funds, project “STARS in the CAOS (Simulation Tools for Astrochemical Reactivity and Spectroscopy in the Cyberinfrastructure for Astrochemical Organic Species)”, Grant Number 2015F59J3R.
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Skouteris, D. et al. (2018). A Theoretical Investigation of the Reaction H+SiS2 and Implications for the Chemistry of Silicon in the Interstellar Medium. In: Gervasi, O., et al. Computational Science and Its Applications – ICCSA 2018. ICCSA 2018. Lecture Notes in Computer Science(), vol 10961. Springer, Cham. https://doi.org/10.1007/978-3-319-95165-2_50
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DOI: https://doi.org/10.1007/978-3-319-95165-2_50
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