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Dissociative charge exchange dynamics of HOCO+ and DOCO+
John D Savee1, Jennifer E Mann, Robert E Continetti
1Department of Chemistry and Biochemistry, University of California at San Diego, 9500 Gilman Drive, La Jolla, California 92093-0340, USA.
The Journal of Physical Chemistry. A
|December 9, 2009
Summary
Researchers studied HOCO and DOCO dissociation using translational spectroscopy. They found HOCO rapidly breaks into OH + CO or H + CO2, with specific branching ratios, offering insights into chemical dynamics.
Area of Science:
- Chemical Physics
- Molecular Spectroscopy
- Physical Chemistry
Background:
- Understanding the dissociation pathways of transient molecules like HOCO is crucial for chemical dynamics.
- Previous studies have explored HOCO isomers and their properties, but direct dissociation dynamics remain an area of active research.
Purpose of the Study:
- To investigate the dissociation dynamics of HOCO and DOCO following charge exchange with cesium.
- To determine the product branching ratios for dissociation into OH/OD + CO and H/D + CO2 channels.
Main Methods:
- Utilized translational spectroscopy to analyze the kinetic energy release distributions of dissociation products.
- Employed charge exchange reactions between fast keV beams of HOCO+/DOCO+ and cesium atoms.
Main Results:
- HOCO is initially formed in the 1(2)A'' electronic state via near-resonant electron capture.
- The excited HOCO state rapidly predissociates into OH + CO and H + CO2.
- Observed branching fractions of 0.75 ± 0.03 for OH + CO and 0.25 ± 0.03 for H + CO2.
Conclusions:
- The study elucidates the rapid predissociation mechanism of HOCO from the 1(2)A'' electronic state.
- Results provide experimental evidence for theoretical predictions regarding HOCO dissociation pathways.
- The findings contribute to a deeper understanding of transient molecule chemistry and spectroscopy.
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