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OH-H2 entrance channel complexes.

R A Loomis¹, M I Lester

¹JILA, National Institute of Standards and Technology and University of Colorado, University of Colorado, Boulder, CO 80309-0440, USA.

Annual Review of Physical Chemistry

|January 1, 1997

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Researchers explored the OH+H2 hydrogen abstraction reaction using experiments and theory. They characterized weakly bound OH-H2 complexes and determined key energy levels and binding energies in the reaction

Area of Science:

Chemical Kinetics
Molecular Spectroscopy
Quantum Chemistry

Background:

The hydroxyl radical (OH) and molecular hydrogen (H2) reaction is fundamental in combustion and atmospheric chemistry.
Understanding the entrance channel dynamics is crucial for accurate reaction rate predictions.

Purpose of the Study:

To investigate the entrance channel of the OH+H2 hydrogen abstraction reaction.
To characterize the weakly bound OH-H2 complex and its potential energy surfaces.
To determine binding energies and intermolecular energy levels.

Main Methods:

Electronic spectroscopy of OH-H2 complexes using OH A2Sigma+-X2Pi transition.
Laser-induced fluorescence and fluorescence depletion experiments.
Inelastic scattering measurements on state-selected OH radicals.

Related Experiment Videos

Photodetachment of electrons from the H3O- anion.

Main Results:

Stabilization and characterization of weakly bound OH-H2 complexes in a shallow entrance channel well.
Determination of binding energies for OH X2Pi + H2/D2.
Mapping of intermolecular energy levels for the OH A2Sigma+ excited state.
Probing of the neutral reaction dynamics via H3O- anion photodetachment.

Conclusions:

Experimental and theoretical studies provide a comprehensive view of the OH+H2 reaction entrance channel.
Detailed characterization of OH-H2 complexes and their interactions offers insights into reaction mechanisms.
The findings contribute to a more accurate understanding of hydrogen abstraction reactions involving radicals.