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Title: A theoretical investigation of HSO/HOS and their positive ions

Abstract

The formation and eventual fate of sulfur-containing aerosols play a central role in global pollution. An understanding of the oxidation paths for sulfur species and of the formation and stability of radical and ionic intermediates is required for optimum control of acid deposition. To gain insight into these processes {ital ab} {ital initio} calculations were performed for ground and first excited electronic states of the isomers HSO/HOS and for the ground and first two excited states for their positive ions, HSO{sup +}/HOS{sup +}. A variety of basis sets were used for calculations at the self-consistent field (SCF) level. (Full details available in supplementary material for this article.) These calculations included full optimization of the geometry and examination of the potential surface for transition states. Post Hartree--Fock calculations were performed and included Moller--Plesset calculations through fourth order with quadruple excitations as well as configuration interaction including all double excitations. The effect of geometry optimization at the MP4 level and the effect of freezing the core orbitals in the calculations were examined. Five transition states for the isomerization of HSO to HOS were located for the ground and excited electronic states of the neutral and ion systems. For all transition states inmore » both systems, the geometry resembles an isosceles triangle. The barriers to rearrangement are quite high, ranging from {similar to}20 to {similar to}60 kcal/mol depending on the state. Two of the barriers were approximately symmetric while three were asymmetric with a lower barrier for HSO to HOS isomerization.« less

Authors:
 [1]
  1. Department of Chemistry, University of Missouri-Columbia, Columbia, MO (USA) Department of Physics, University of Missouri-Columbia, Columbia, MO (USA)
Publication Date:
OSTI Identifier:
6776873
Resource Type:
Journal Article
Journal Name:
Journal of Chemical Physics; (USA)
Additional Journal Information:
Journal Volume: 92:11; Journal ID: ISSN 0021-9606
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; SULFUR COMPOUNDS; ELECTRONIC STRUCTURE; ISOMERIZATION; ACID RAIN; AIR POLLUTION; ATMOSPHERIC CHEMISTRY; CATIONS; CONFIGURATION INTERACTION; CONFORMATIONAL CHANGES; HARTREE-FOCK METHOD; OXIDATION; POLLUTANTS; RADICALS; ATMOSPHERIC PRECIPITATIONS; CHARGED PARTICLES; CHEMICAL REACTIONS; CHEMISTRY; IONS; POLLUTION; RAIN; 540120* - Environment, Atmospheric- Chemicals Monitoring & Transport- (1990-)

Citation Formats

Plummer, P L.M. A theoretical investigation of HSO/HOS and their positive ions. United States: N. p., 1990. Web. doi:10.1063/1.458300.
Plummer, P L.M. A theoretical investigation of HSO/HOS and their positive ions. United States. https://doi.org/10.1063/1.458300
Plummer, P L.M. 1990. "A theoretical investigation of HSO/HOS and their positive ions". United States. https://doi.org/10.1063/1.458300.
@article{osti_6776873,
title = {A theoretical investigation of HSO/HOS and their positive ions},
author = {Plummer, P L.M.},
abstractNote = {The formation and eventual fate of sulfur-containing aerosols play a central role in global pollution. An understanding of the oxidation paths for sulfur species and of the formation and stability of radical and ionic intermediates is required for optimum control of acid deposition. To gain insight into these processes {ital ab} {ital initio} calculations were performed for ground and first excited electronic states of the isomers HSO/HOS and for the ground and first two excited states for their positive ions, HSO{sup +}/HOS{sup +}. A variety of basis sets were used for calculations at the self-consistent field (SCF) level. (Full details available in supplementary material for this article.) These calculations included full optimization of the geometry and examination of the potential surface for transition states. Post Hartree--Fock calculations were performed and included Moller--Plesset calculations through fourth order with quadruple excitations as well as configuration interaction including all double excitations. The effect of geometry optimization at the MP4 level and the effect of freezing the core orbitals in the calculations were examined. Five transition states for the isomerization of HSO to HOS were located for the ground and excited electronic states of the neutral and ion systems. For all transition states in both systems, the geometry resembles an isosceles triangle. The barriers to rearrangement are quite high, ranging from {similar to}20 to {similar to}60 kcal/mol depending on the state. Two of the barriers were approximately symmetric while three were asymmetric with a lower barrier for HSO to HOS isomerization.},
doi = {10.1063/1.458300},
url = {https://www.osti.gov/biblio/6776873}, journal = {Journal of Chemical Physics; (USA)},
issn = {0021-9606},
number = ,
volume = 92:11,
place = {United States},
year = {Fri Jun 01 00:00:00 EDT 1990},
month = {Fri Jun 01 00:00:00 EDT 1990}
}