Study of electronic structure and dynamics of interacting free radicals influenced by water

Shiyu Du, Joseph S. Francisco, Sabre Kais

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

We present a study of electronic structure, stability, and dynamics of interaction and recombination of free radicals such as H O2 and OH influenced by water. As simple model calculations, we performed ab initio and density functional calculations for the interaction of H O2 and OH in the presence of water cluster. Results indicate that a significant interaction, overcoming the repulsive Columbic barrier, occurs at a separation distance between the radicals of 5.7 Å. This confirms early predictions of the minimum size of molecular dianions stable in the gas phase. It is well known that atomic dianions are unstable in the gas phase but molecular dianions are stable when the size of the molecule is larger than 5.7 Å. Ab initio molecular dynamics calculations with Car-Parrinello scheme show that the reaction is very fast and occurs on a time scale of about 1.5 ps. The difference in stability and dynamics of the interacting free radicals on singlet and triplet potential energy surfaces is also discussed.

Original languageEnglish
Article number124312
JournalJournal of Chemical Physics
Volume130
Issue number12
DOIs
Publication statusPublished - 8 Apr 2009
Externally publishedYes

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free radicals
Free Radicals
Electronic structure
Gases
electronic structure
Potential energy surfaces
Water
vapor phases
water
Density functional theory
Molecular dynamics
Railroad cars
interactions
Molecules
potential energy
molecular dynamics
predictions
molecules

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

Cite this

Study of electronic structure and dynamics of interacting free radicals influenced by water. / Du, Shiyu; Francisco, Joseph S.; Kais, Sabre.

In: Journal of Chemical Physics, Vol. 130, No. 12, 124312, 08.04.2009.

Research output: Contribution to journalArticle

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