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- Title
Charge decay in the spatial afterglow of plasmas and its impact on diffusion regimes.
- Authors
Abuyazid, Nabiel H.; Üner, Necip B.; Peyres, Sean M.; Mohan Sankaran, R.
- Abstract
The spatial afterglow is a region at the boundary of a non-equilibrium plasma where charged species relax into ambient equilibrium. In many applications, the spatial afterglow is the part of the plasma that interacts with surfaces, such as suspended particles or a material substrate. However, compared to the bulk plasma, there has been little effort devoted to studying the properties of the spatial afterglow, and a fundamental analysis has not yet been developed. Here, we apply double Langmuir probe measurements and develop an advection-diffusion-recombination model to provide a detailed description of charged species in the spatial afterglow over a wide range of pressures, temperatures, plasma dimensions, and flow rates. We find that the density of charged species in the spatial afterglow decays by orders of magnitude, which leads to a transition from ambipolar to free diffusion. These insights can be used to explain or predict experimental observations of phenomena, such as the charging of dust grains and the dose of charged species to a biomaterial. Plasmas have different properties at the boundaries as compared to the bulk which has important implications for applications. Here, the authors study charge decay in a spatial afterglow by both experimental diagnostics and modeling to reveal a transition from ambipolar to free diffusion.
- Subjects
NONEQUILIBRIUM plasmas; LANGMUIR probes; GAMMA ray bursts; ADVECTION-diffusion equations
- Publication
Nature Communications, 2023, Vol 14, Issue 1, p1
- ISSN
2041-1723
- Publication type
Article
- DOI
10.1038/s41467-023-42442-9