Surface processes involving nitrogen molecules and atoms on silica surface at low temperature: the role of energy exchanges
| Autor: | Maria Rutigliano, Fernando Pirani |
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| Rok vydání: | 2022 |
| Předmět: | |
| Zdroj: | Plasma Sources Science and Technology. 31:094006 |
| ISSN: | 1361-6595 0963-0252 |
| Popis: | The dynamics of elementary surface processes, promoted by nitrogen atoms and molecules impacting a silica surface, has been investigated by adopting a semiclassical scattering method. The appropriate treatment of the long-range interaction forces emphasized the crucial control exercised by the weakly bound precursor state on the stereo-dynamics of all basic elementary processes occurring at the gas-surface inter-phase. Molecular dynamics simulations have highlighted the role of vibrationally excited molecules in plasma dynamics. Indeed, N2 molecules, impinging the surface in low-medium vibrational levels, conserve the initial vibration state while are inelastically scattered, rotationally excited and translationally colder. Moreover, N2 molecules nascent from the atomic recombination on the surface have a fair probability of forming at very high vibrational levels, with a consistent part of reaction exothermicity transferred to the translational energy. Consequently, the surface induces a strong non-equilibrium condition, influencing directly the dynamics of processes occurring in the plasma bulk. |
| Databáze: | OpenAIRE |
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