Site-Specific Molecule-Surface Interactions on Metal Oxides
Abstract
Collision induced dissociation of highly excited NO2 was observed for the first time for well characterized MgO(100) surfaces with parent and product angular resolution at various internal and incident translational energies, and with product NO state-selected detection. A model was developed which explains the results, and enabled comparisons with the corresponding gas-phase experiments. Scattering of HCl(v=0) was examined at incident energies 0.11-0.90 eV, and demonstrated the transition between direct-inelastic scattering to trapping-desorption. At low incident energies rotational and translational temperatures of scattered HCl were equal to the surface temperature, and residence times in the millisecond regime were observed at low surface temperature. When HCl(v=2, J=1) was scattered from the surface, vibrational excitation survived the process of trapping-desorption, and HCl in v=2 was scattered into the gas phase. The residence time, however, was less than a microsecond at all temperatures. These results were reconciled with the scattering results of HCl in v=0 using a model that described the competition between hopping on terrace sites, desorption, and deactivation on defect sites.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 1998
- Accession Number
- ADA356868
Entities
People
- Curt Wittig
- Hanna Reisler
Organizations
- University of Southern California