Preferential vibrational excitation in microwave nitrogen plasma assessed by Raman scattering
| Autor: | Teofil Minea, D. C. M. van den Bekerom, N Gatti, S. Ponduri, F. J. J. Peeters, M.C.M. van de Sanden, Paolo Tosi, G.J. van Rooij |
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| Přispěvatelé: | Applied Physics and Science Education, Plasma & Materials Processing |
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
010302 applied physics
Raman scattering non-thermal Plasma Materials science Analytical chemistry Context (language use) 02 engineering and technology Plasma Nonthermal plasma 021001 nanoscience & nanotechnology Condensed Matter Physics nitrogen activation vibrational excitation 01 natural sciences Endothermic process Ion source symbols.namesake nitrogen fixation 0103 physical sciences symbols microwave flowing reactor Specific energy 0210 nano-technology Microwave |
| Zdroj: | Plasma Sources Science and Technology, 27, 055006 Plasma Sources Science and Technology, 27(5):055006. Institute of Physics |
| ISSN: | 1361-6595 0963-0252 |
| DOI: | 10.1088/1361-6595/aabd60 |
| Popis: | Vibrational activation of N2 molecules in a flowing microwave plasma is investigated in the context of utilising electrical energy for chemical conversion. Spatial profiles of rotational (Tr) and vibrational (T v) temperatures are measured by Raman scattering. Maximum values of T r = 3500 K and T v = 6000 K were observed in the centre of the plasma at low pressure (50 mbar). A detailed quantification of the local energy content shows how the strong non-equilibrium character of low pressure discharges compares with a closer-to-equilibrium energy distribution at higher pressures. Measurements performed downstream of the plasma display the ability of the microwave flowing reactor to deliver up to 48% of the specific energy input (SEI) into internal degrees of freedom of the gas molecules. Specifically, 23% of the SEI is loaded into the vibrational mode, which is potentially available to enhance chemical reactivity of endothermic reactions. |
| Databáze: | OpenAIRE |
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