Translational energy and state resolved observations of D and D-2 thermally desorbing from D clusters chemisorbed on graphite
| Autor: | Alan C. Luntz, Liv Hornekær, V.V. Petrunin, Z. Sljivancanin, Saoud Baouche, A. Baurichter |
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| Rok vydání: | 2009 |
| Předmět: |
inorganic chemicals
Thermal desorption General Physics and Astronomy 02 engineering and technology atomic clusters 7. Clean energy 01 natural sciences Soft laser desorption Quantitative Biology::Subcellular Processes Condensed Matter::Materials Science multiphoton processes Desorption 0103 physical sciences Atom Physics::Atomic and Molecular Clusters Physics::Atomic Physics Physical and Theoretical Chemistry 010306 general physics density functional theory deuterium Surface diffusion Resonance-enhanced multiphoton ionization chemisorbed layers Chemistry graphite thermally stimulated desorption 021001 nanoscience & nanotechnology surface diffusion Deuterium Density functional theory annealing Atomic physics 0210 nano-technology time of flight spectra |
| Zdroj: | Journal of Chemical Physics Petrunin, V V 2009, ' Translational energy and state resolved observations of D and D 2 thermally desorbing from D clusters chemisorbed on graphite ', Journal of Chemical Physics, vol. 131, no. 24, pp. 244707 . https://doi.org/10.1063/1.3274655 |
| DOI: | 10.1063/1.3274655 |
| Popis: | Direct D atom desorption, as well as associative desorption of D-2 molecules are observed in thermal desorption from D atoms chemisorbed on a C(0001) surface by combining laser induced T-jumps with resonance enhanced multiphoton ionization detection. Bleaching curves suggest that different classes of chemisorbed D atom clusters are present on the initial surface. The energy resolved atomic desorption flux, obtained via time of flight techniques, compares favorably (via detailed balance) with theoretical calculations of atomic sticking. Density functional theory calculations of chemical processes (atomic desorption, atomic diffusion/cluster annealing, and associative desorption) on an extensive set of four atom H(D) clusters chemisorbed on C(0001) provide a good interpretation of the experiments. State and energy resolved D-2 desorption fluxes are compared with previous state averaged results. In combination with density functional theory calculations these measurements reveal a substantial energy loss ( GT 1 eV) to the surface in the associative desorption. |
| Databáze: | OpenAIRE |
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