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Time-resolved imaging of the reaction coordinate
Richard Mabbs1, Kostyantyn Pichugin, Andrei Sanov
1Department of Chemistry, University of Arizona, Tucson, 85721-0041, USA.
The Journal of Chemical Physics
|May 25, 2005
Summary
Time-resolved photoelectron imaging reveals the dissociation dynamics of the iodine monobromide anion (IBr(-)). This study uses iodine dimer anion (I2(-)) as a reference to map IBr(-) dissociation potentials.
Area of Science:
- Physical Chemistry
- Chemical Physics
- Molecular Dynamics
Background:
- Negative ion photoelectron imaging is a powerful technique for probing molecular dynamics.
- Iodine dimer anion (I2(-)) dissociation is a well-understood benchmark system.
Purpose of the Study:
- To investigate the photodissociation dynamics of iodine monobromide anion (IBr(-)) using time-resolved photoelectron imaging.
- To compare IBr(-) dissociation with the reference system I2(-).
- To construct an experimental map of the IBr(-) dissociation potential energy surface.
Main Methods:
- Time-resolved photoelectron imaging with a (780 nm pump, 390 nm probe) laser system.
- Photodissociation of IBr(-) and I2(-) negative ions.
- Comparison of experimental data with classical trajectory calculations.
- Modeling of time-resolved photoelectron spectra.
Main Results:
- Experimental data provide dynamical tests of anion electronic potentials.
- Energetics evolution during dissociation were analyzed.
- Good agreement was found between experimental results and theoretical predictions.
- An experimental dissociation potential for IBr(-) was constructed.
Conclusions:
- Time-resolved photoelectron imaging successfully elucidates IBr(-) photodissociation dynamics.
- The study validates theoretical models and provides insights into anion electronic potentials.
- A detailed experimental potential energy surface for IBr(-) dissociation was obtained.