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The OH radical-H2O molecular interaction potential.

Shiyu Du1, Joseph S Francisco, Gregory K Schenter

  • 1Department of Chemistry, Purdue University, West Lafayette, Indiana 47907-1393, USA.

The Journal of Chemical Physics
|June 21, 2006
PubMed
Summary
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Researchers developed a new potential model for hydroxyl radical (OH) and water interactions. This model accurately describes both ground and excited states, crucial for atmospheric chemistry.

Area of Science:

  • Atmospheric Chemistry
  • Quantum Chemistry
  • Computational Chemistry

Background:

  • The hydroxyl radical (OH) is a key atmospheric oxidant due to its high reactivity.
  • Understanding OH interactions with water is vital for atmospheric modeling.
  • The H(2)O.OH complex exhibits a low-lying excited state impacting OH radical behavior.

Purpose of the Study:

  • Develop a novel analytical functional form for the OH-water interaction potential.
  • Accurately model the OH radical's interaction with H(2)O in both ground and excited states.
  • Provide a benchmark for theoretical studies of (H(2)O)nOH clusters.

Main Methods:

  • Fitting an analytical functional form to high-level ab initio data.
  • Performing potential energy surface scans using CCSD(T)/aug-cc-pVTZ.

Related Experiment Videos

  • Developing a tensor polarizability generalization of a Thole-type potential for the OH radical.

    • Main Results:

    • A new analytical potential functional form for OH-H(2)O interactions was developed.
    • The potential effectively describes interactions for both ground and excited electronic states of the complex.
    • Stationary points of (H(2)O)nOH clusters were identified, serving as benchmarks.

    Conclusions:

    • The developed potential provides an accurate description of OH-water interactions, including excited states.
    • This model is crucial for understanding the role of the OH radical in atmospheric processes.
    • The study offers a valuable tool for future research on water-OH clusters.