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Charge decay in the spatial afterglow of plasmas and its impact on diffusion regimes

Author

Listed:
  • Nabiel H. Abuyazid

    (University of Illinois at Urbana-Champaign)

  • Necip B. Üner

    (University of Illinois at Urbana-Champaign
    Middle East Technical University)

  • Sean M. Peyres

    (University of Illinois at Urbana-Champaign)

  • R. Mohan Sankaran

    (University of Illinois at Urbana-Champaign)

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.

Suggested Citation

  • Nabiel H. Abuyazid & Necip B. Üner & Sean M. Peyres & R. Mohan Sankaran, 2023. "Charge decay in the spatial afterglow of plasmas and its impact on diffusion regimes," Nature Communications, Nature, vol. 14(1), pages 1-10, December.
    • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-42442-9
    DOI: 10.1038/s41467-023-42442-9
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    References listed on IDEAS

    as
    1. John A. Tomko & Michael J. Johnson & David R. Boris & Tzvetelina B. Petrova & Scott G. Walton & Patrick E. Hopkins, 2022. "Plasma-induced surface cooling," Nature Communications, Nature, vol. 13(1), pages 1-7, December.
    2. B. Minderhout & J. C. A. Huijstee & R. M. H. Rompelberg & A. Post & A. T. A. Peijnenburg & P. Blom & J. Beckers, 2021. "Charge of clustered microparticles measured in spatial plasma afterglows follows the smallest enclosing sphere model," Nature Communications, Nature, vol. 12(1), pages 1-7, December.
    3. Sanghoo Park & Wonho Choe & Hyungyu Lee & Joo Young Park & Jinwoo Kim & Se Youn Moon & Uroš Cvelbar, 2021. "Stabilization of liquid instabilities with ionized gas jets," Nature, Nature, vol. 592(7852), pages 49-53, April.
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