{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,19]],"date-time":"2026-02-19T20:51:11Z","timestamp":1771534271938,"version":"3.50.1"},"reference-count":78,"publisher":"AIP Publishing","issue":"10","funder":[{"DOI":"10.13039\/100018694","name":"Horizon Europe Marie Sklodowska-Curie Actions","doi-asserted-by":"publisher","award":["894321"],"award-info":[{"award-number":["894321"]}],"id":[{"id":"10.13039\/100018694","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["pubs.aip.org"],"crossmark-restriction":true},"short-container-title":[],"published-print":{"date-parts":[[2022,9,14]]},"abstract":"<jats:p>SiC2 is a fascinating molecule due to its unusual bonding and astrophysical importance. In this work, we report the first global potential energy surface (PES) for ground-state SiC2 using the combined-hyperbolic-inverse-power-representation method and accurate ab initio energies. The calibration grid data are obtained via a general dual-level protocol developed afresh herein that entails both coupled-cluster and multi-reference configuration interaction energies jointly extrapolated to the complete basis set limit. Such an approach is specially devised to recover much of the spectroscopy from the PES, while still permitting a proper fragmentation of the system to allow for reaction dynamics studies. Besides describing accurately the valence strongly bound region that includes both the cyclic global minimum and isomerization barriers, the final analytic PES form is shown to properly reproduce dissociation energies, diatomic potentials, and long-range interactions at all asymptotic channels, in addition to naturally reflect the correct permutational symmetry of the potential. Bound vibrational state calculations have been carried out, unveiling an excellent match of the available experimental data on c-SiC2(A11). To further exploit the global nature of the PES, exploratory quasi-classical trajectory calculations for the endothermic C2 + Si \u2192 SiC + C reaction are also performed, yielding thermalized rate coefficients for temperatures up to 5000\u00a0K. The results hint for the prominence of this reaction in the innermost layers of the circumstellar envelopes around carbon-rich stars, hence conceivably playing therein a key contribution to the gas-phase formation of SiC, and eventually, solid SiC dust.<\/jats:p>","DOI":"10.1063\/5.0096364","type":"journal-article","created":{"date-parts":[[2022,8,8]],"date-time":"2022-08-08T15:36:15Z","timestamp":1659972975000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":6,"title":["Reconciling spectroscopy with dynamics in global potential energy surfaces: The case of the astrophysically relevant SiC2"],"prefix":"10.1063","volume":"157","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-4118-8308","authenticated-orcid":false,"given":"C. M. R.","family":"Rocha","sequence":"first","affiliation":[{"name":"Laboratory for Astrophysics, Leiden Observatory, Leiden University 1 , P.O. Box 9513, NL-2300 RA Leiden, The Netherlands"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8322-3538","authenticated-orcid":false,"given":"H.","family":"Linnartz","sequence":"additional","affiliation":[{"name":"Laboratory for Astrophysics, Leiden Observatory, Leiden University 1 , P.O. Box 9513, NL-2300 RA Leiden, The Netherlands"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1501-3317","authenticated-orcid":false,"given":"A. J. C.","family":"Varandas","sequence":"additional","affiliation":[{"name":"School of Physics and Physical Engineering, Qufu Normal University 2 , 273165 Qufu, China"},{"name":"Department of Physics, Universidade Federal do Esp\u00edrito Santo 3 , 29075-910 Vit\u00f3ria, Brazil"},{"name":"Department of Chemistry, and Chemistry Centre, University of Coimbra 4 , 3004-535 Coimbra, Portugal"}]}],"member":"317","published-online":{"date-parts":[[2022,9,8]]},"reference":[{"key":"2023081006153990100_c1","doi-asserted-by":"publisher","first-page":"L45","DOI":"10.1086\/184330","article-title":"Identification of the SiCC radical toward IRC+10216: The first molecular ring in an astronomical source","volume":"283","year":"1984","journal-title":"Astrophys. J."},{"key":"2023081006153990100_c2","first-page":"377","article-title":"A molecular radio line survey of the carbon star IRAS 15194-5115","volume":"269","year":"1993","journal-title":"Astron. 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