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Thermal rate coefficients and other collisional properties are calculated for its formation via the title reaction using the quasi-classical trajectory method. An accurate representation of the HSiS potential energy surface is employed, which has been modelled from high-level ab initio calculations and a reliable description of long-range interactions as implied by the underlying double many-body expansion method. The calculated rate coefficients for the $\\rm SiH + S \\rightarrow SiS + H$ reaction can be modelled with k(T)\u00a0= \u03b1(T\/300)\u03b2e\u2212\u03b3\/T where $\\alpha =0.63\\times 10^{-10}\\, \\rm cm^3\\, s^{-1}$, \u03b2\u00a0= -0.11, and $\\gamma = 11.6\\, \\rm K$. This result is only slightly lower than that for SiS formation via Si\u00a0+\u00a0SH collisions. The contribution of each reaction mechanism and the rovibrational energy distributions of the nascent SiS molecule are also calculated. The title collision can also yield SH ($\\rm SiH + S \\rightarrow SH + Si$), but the corresponding rate coefficient is 20 to 27\u00a0times smaller than for SiS formation ($\\alpha =0.025\\times 10^{-10}\\rm cm^3\\, s^{-1}$, \u03b2\u00a0=-0.13, and $\\gamma = 9.38\\, \\rm K$). The role of intersections between excited electronic states is also discussed, based on novel calculations including eight electronic states.<\/jats:p>","DOI":"10.1093\/mnras\/stad2580","type":"journal-article","created":{"date-parts":[[2023,8,26]],"date-time":"2023-08-26T06:39:23Z","timestamp":1693031963000},"page":"5353-5358","source":"Crossref","is-referenced-by-count":6,"title":["SiS formation in the interstellar medium via SiH\u00a0+\u00a0S collisions"],"prefix":"10.1093","volume":"525","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-4184-2437","authenticated-orcid":false,"given":"B R L","family":"Galv\u00e3o","sequence":"first","affiliation":[{"name":"Centro Federal de Educa\u00e7\u00e3o Tecnol\u00f3gica de Minas Gerais , CEFET-MG Av. 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