The S$^+$($^4$S) + SiH$_{2}$($^1$A$_1$) Reaction: Toward the Synthesis of Interstellar SiS

Luca Mancini; Marco Trinari; Emília Valença Ferreira de Aragão; Marzio Rosi; Nadia Balucani

doi:10.1007/978-3-031-10562-3_17

paper

The S $^{+}$ ( $^{4}$ S) + SiH $_{2}$ ( $^{1}$ A $_{1}$ ) Reaction: Toward the Synthesis of Interstellar SiS

arXiv:2212.11754 · doi:10.1007/978-3-031-10562-3_17

Abstract

We have performed a theoretical investigation of the S $^{+}$ ( $^{4}$ S) + SiH $_{2}$ ( $^{1}$ A $_{1}$ ) reaction, a possible formation route of the HSiS $^{+}$ and SiSH $^{+}$ cations that are alleged to be precursors of interstellar silicon sulfide, SiS. Electronic structure calculations allowed us to identify the main reaction pathways for the systems. The reaction has two exothermic channels leading to the isomeric species $^{3}$ HSiS $^{+}$ and $^{3}$ SiSH $^{+}$ formed in conjunction with H atoms. The reaction is not characterized by an entrance barrier and, therefore, it is believed to be fast also under the very low temperature conditions of interstellar clouds. The two ions are formed in their first electronically excited state because of the spin multiplicity of the overall potential energy surface. In addition, following the suggestion that neutral species are formed by proton transfer of protonated cations to ammonia, we have derived the potential energy surface for the reactions $^{3}$ HSiS $^{+}$ / $^{3}$ SiSH $^{+}$ + NH $_{3}$ ( $^{1}$ A $_{1}$ ).

arXiv comment15 pages, 7 figures. Preprint version submitted to LNCS (Springer) ICCSA2022

The S+(4S) + SiH2​(1A1​) Reaction: Toward the Synthesis of Interstellar SiS

Abstract

References in corpus (11)

The S $^{+}$ ( $^{4}$ S) + SiH $_{2}$ ( $^{1}$ A $_{1}$ ) Reaction: Toward the Synthesis of Interstellar SiS