Infrared wavelength-selective photodesorption on diamond surfaces
| Autor: | Gunter Lüpke, J. Sturmann, Norman Tolk, A. Ueda, J.L. Davidson, Jonathan M. Gilligan, Alan V. Barnes, Royal G. Albridge |
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| Rok vydání: | 1998 |
| Předmět: |
Chemistry
Infrared Analytical chemistry General Physics and Astronomy Diamond Surfaces and Interfaces General Chemistry engineering.material Condensed Matter Physics Laser Fluence Molecular physics Surfaces Coatings and Films law.invention Wavelength law Desorption engineering Grain boundary Absorption (electromagnetic radiation) |
| Zdroj: | Applied Surface Science. :59-63 |
| ISSN: | 0169-4332 |
| DOI: | 10.1016/s0169-4332(97)00610-7 |
| Popis: | We report first studies of photodesorption from diamond films using the Vanderbilt Free-Electron Laser at two infrared wavelengths: 3.5 μ m, corresponding to localized absorption by C–H bonds at grain boundaries, and 5 μ m, corresponding to two-phonon absorption by the bulk diamond. At 3.5 μ m, we observe two photodesorption thresholds at fluences well below the onset of ablation. In contrast, at 5 μ m, a single photodesorption threshold is identified at a fluence which is close to the second fluence threshold, observed at 3.5 μ m. These experiments shed light on the physics of wavelength selective desorption through non-electronic channels. |
| Databáze: | OpenAIRE |
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