Localized Probing of Gas Molecule Adsorption Energies and Desorption Attempt Frequencies
| Autor: | Milos Toth, Jared Cullen, Michael J. Ford, Charlene J. Lobo, Alan Bahm |
|---|---|
| Rok vydání: | 2015 |
| Předmět: |
Chemistry
Kinetics Surfaces Coatings and Films Electronic Optical and Magnetic Materials Condensed Matter::Materials Science General Energy Adsorption Chemical physics Etching Desorption Cathode ray Deposition (phase transition) Molecule Physics::Chemical Physics Physical and Theoretical Chemistry Atomic physics Nanoscopic scale |
| Zdroj: | The Journal of Physical Chemistry C. 119:15948-15953 |
| ISSN: | 1932-7455 1932-7447 |
| DOI: | 10.1021/acs.jpcc.5b00918 |
| Popis: | Gas-mediated electron beam induced etching (EBIE) and deposition (EBID) can be used to measure activation energies that are interpreted as the adsorption energies of surface-adsorbed precursor molecules. However, the measured quantities often disagree with adsorption energies measured by conventional analysis techniques such as thermally programmed desorption and have anomalous dependencies on parameters such as the electron beam current used to perform EBID. Here, we use the theory of EBIE and EBID rate kinetics to explain this behavior and identify conditions under which the activation energies and the associated pre-exponential factors correspond to gas molecule adsorption energies and desorption attempt frequencies, respectively. Under these conditions, EBIE and EBID can be used as robust, nanoscale techniques for the analysis of adsorbates. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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