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Updated: Jun 4, 2026

Multiscale Sampling of a Heterogeneous Water/Metal Catalyst Interface using Density Functional Theory and Force-Field Molecular Dynamics
Published on: April 12, 2019
CASPT2 study of the potential energy surface of the HSO2 system
Juan D Garrido1, Maikel Y Ballester, Yoelvis Orozco-González
1Instituto de Física, Universidade de São Paulo, São Paulo, SP, Brazil.
Abstract:
The importance of the HSO(2) system in atmospheric and combustion chemistry has motivated several works dedicated to the study of associated structures and chemical reactions. Nevertheless controversy still exists in connection with the reaction SH + O(2)→ H + SO(2) and also related to the role of the HSOO isomers in the potential energy surface (PES). Here we report high-level ab initio calculation for the electronic ground state of the HSO(2) system. Energetic, geometric, and frequency properties for the major stationary states of the PES are reported at the same level of calculations: CASPT2/aug-cc-pV(T+d)Z. This study introduces three new stationary points (two saddle points and one minimum). These structures allow the connection of the skewed HSOO(s) and the HSO(2) minima defining new reaction paths for SH + O(2) → H + SO(2) and SH + O(2) → OH + SO. In addition, the location of the HSOO isomers in the reaction pathways have been clarified.
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