Related Experiment Videos
Lateral interactions and multi-isotherms: nitrogen recombination from Rh(111)
C G M Hermse1, A P van Bavel, B E Nieuwenhuys
1Schuit Institute of Catalysis, ST/SKA, Eindhoven University of Technology, Post Office Box 513, 5600 MB Eindhoven, The Netherlands. chretien@sg10.chem.tue.nl
Langmuir : the ACS Journal of Surfaces and Colloids
|August 24, 2005
Summary
Lateral interactions between adsorbed molecules affect desorption rates. Researchers used a multi-isotherm method and kinetic Monte Carlo modeling to study nitrogen on Rh(111), successfully determining these interactions.
Area of Science:
- Surface Science
- Physical Chemistry
- Computational Chemistry
Background:
- Lateral adsorbate-adsorbate interactions influence desorption kinetics.
- These interactions cause variations in desorption rate constants with surface coverage.
- Multi-isotherm analysis provides a detailed method to study these effects.
Purpose of the Study:
- To investigate the impact of lateral adsorbate-adsorbate interactions on desorption rates.
- To accurately determine lateral interactions between nitrogen atoms on a Rh(111) surface.
- To validate a computational approach against experimental multi-isotherm data.
Main Methods:
- Experimental generation of multi-isotherm data by stepwise temperature increases.
- Development and application of a detailed kinetic Monte Carlo (kMC) model.
- Utilization of an optimization algorithm based on Evolutionary Strategy (ES).
Main Results:
- Successfully reproduced the experimentally measured multi-isotherm shape for nitrogen on Rh(111).
- Quantified the lateral interactions between nitrogen atoms on the Rh(111) surface.
- Demonstrated the capability of the kMC model and ES optimization to capture surface phenomena.
Conclusions:
- Lateral interactions significantly impact desorption dynamics.
- The combined kMC and ES approach is effective for characterizing adsorbate interactions.
- This study provides valuable insights into nitrogen adsorption on metal surfaces.