Investigation of N(4S) kinetics during the transients of a strongly emissive pulsed ECR plasma using ns-TALIF
| Autor: | Kristaq Gazeli, E Bisceglia, C. Y. Duluard, S. Prasanna, Khaled Hassouni, Guillaume Lombardi, X. Aubert |
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| Přispěvatelé: | Laboratoire des Sciences des Procédés et des Matériaux (LSPM), Institut Galilée-Université Sorbonne Paris Cité (USPC)-Centre National de la Recherche Scientifique (CNRS)-Université Sorbonne Paris Nord, Laboratoire de physique des gaz et des plasmas (LPGP), Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), ANR-16-CE30-0004,ASPEN,Production d'espèces atomiques via les états électroniques excités dans des plasmas à haute densité énergétique(2016) |
| Rok vydání: | 2021 |
| Předmět: |
Materials science
microwave Kinetics 02 engineering and technology 01 natural sciences law.invention [PHYS.PHYS.PHYS-PLASM-PH]Physics [physics]/Physics [physics]/Plasma Physics [physics.plasm-ph] law 0103 physical sciences Atom pulsed plasma Physics::Atomic Physics Absorption (electromagnetic radiation) Laser-induced fluorescence TALIF 010302 applied physics Plasma 021001 nanoscience & nanotechnology Condensed Matter Physics Laser kinetics nitrogen dissociation Atomic physics 0210 nano-technology Microwave Excitation |
| Zdroj: | Plasma Sources Science and Technology Plasma Sources Science and Technology, IOP Publishing, In press, 30, pp.095001. ⟨10.1088/1361-6595/ac0da1⟩ |
| ISSN: | 1361-6595 0963-0252 |
| DOI: | 10.1088/1361-6595/ac0da1 |
| Popis: | International audience; Nanosecond-two-photon absorption laser induced fluorescence (ns-TALIF) technique was employed to investigate the transients of a strongly emissive pulsed microwave discharge. We analysed the conditions that have to be fulfilled in order to use the TALIF intensities measured with the laser central frequency tuned to the absorption peak instead of the fully integrated laser excitation spectrum absorption for measuring N-atom densities. We demonstrate the validity of the method in our conditions and applied it for the straight forward monitoring of N-atom densities during the transients of a pulsed ECR plasma. We especially demonstrated the existence of an unexpected increase in N(4S) atom density of about 10% at the early stage of the transition from high- to low-power phase. Using a self-consistent quasi-homogenous plasma model encompassing a detailed state-to-state kinetics, a thorough analysis of the N-atom and N2(B) kinetics was carried out and enabled attributing this enhancement to surface de-excitation of N(2D) and N(2P) atoms. The rise of the N(4S) atom density can serve as an indicator of the concentration of N(2D) and N(2P) atoms in the discharge. |
| Databáze: | OpenAIRE |
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