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Photodissociation of the N2-NO Complex between 225.8 and 224.0 nm
Bradley F Parsons1, Cameron J Jayson1, David E Szpunar2
1Department of Chemistry, Creighton University, 2500 California Plaza, Omaha, Nebraska 68178, United States.
Researchers measured the NO (A) photoproduct appearance energy and ground-state dissociation energy of the N2-NO complex. This study provides key insights into the energy partitioning during molecular dissociation.
Area of Science:
- Chemical Physics
- Molecular Spectroscopy
- Photochemistry
Background:
- The N2-NO complex is a key system for understanding molecular interactions and energy transfer.
- Previous studies have investigated its spectroscopic properties, but precise energy measurements remain crucial.
Purpose of the Study:
- To accurately determine the appearance energy of the NO (A) photoproduct.
- To calculate the ground-state dissociation energy of the N2-NO complex.
- To investigate the energy partitioning in the dissociation process.
Main Methods:
- Velocity map ion imaging of NO photofragments.
- Photoexcitation of the N2-NO complex using tunable lasers.
- Two-photon ionization of the NO (A) photoproduct.
Main Results:
- The appearance energy for the NO (A) photoproduct was determined to be 44,284.7 ± 2.8 cm⁻¹.
- The ground-state dissociation energy of the N2-NO complex was found to be 85.8 ± 2.8 cm⁻¹.
- Excess energy was observed to partition into rotational and translational energy of the diatomic products.
Conclusions:
- The determined energy values provide critical benchmarks for theoretical models.
- The study confirms the partitioning of excess energy into rotational and translational modes.
- Internally excited complexes were observed, consistent with the ground-state dissociation energy.
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