Transition from afterglow to streamer discharge in an atmospheric capacitively coupled micro-plasma jet

IF 3.5 2区物理与天体物理 Q2 PHYSICS, APPLIED

Applied Physics Letters Pub Date : 2024-11-11 DOI:10.1063/5.0232114

Sylvain Iseni, Thalita M. C. Nishime, Torsten Gerling

引用次数: 0

Abstract

This Letter focuses on the discharge mechanisms of an atmospheric pressure micro-plasma jet optimized for endoscopic applications in biology and medicine. This capacitively coupled plasma (CCP) features a concentric double flow allowing for shielding the Helium or Neon plasma gas with carbon dioxide from the humid ambient air. High-resolution optical emission spectroscopy allows for the analyses of the Stark effect of the He I 492.19 nm and the Hydrogen Hβ lines to determine the electric field (EF) and the electron density spatially resolved along the discharge expansion outside the source. EF in Neon at atmospheric pressure was reliably determined with the Stark shift measurement of the weak Ne I line at 515.196 nm. In both gases, the EF diagnostic revealed a steep transition from CCP afterglow to streamer discharge with a magnitude up to 30 kV/cm. This research is a significant step forward in the field of plasma medicine with a plasma source capable of delivering a reactive chemistry with or without an intense EF to the target.

查看原文本刊更多论文

大气电容耦合微等离子体射流从余辉到流束放电的过渡

这封信主要介绍了一种大气压微等离子体射流的放电机制，该射流经过优化，可用于生物和医学领域的内窥镜应用。这种电容耦合等离子体（CCP）具有同心双流的特点，可以用二氧化碳屏蔽潮湿环境空气中的氦气或氖气等离子气体。利用高分辨率光学发射光谱分析 He I 492.19 nm 线和氢 Hβ 线的斯塔克效应，可以确定电场（EF）和电子密度，并沿放电源外的放电扩展进行空间分辨。通过对波长为 515.196 nm 的弱 Ne I 线进行斯塔克偏移测量，可以可靠地确定大气压下氖中的 EF。在这两种气体中，EF 诊断显示了从 CCP 余辉到流形放电的陡峭过渡，幅度高达 30 kV/cm。这项研究在等离子体医学领域迈出了重要的一步，等离子体源能够向目标提供有或无强 EF 的活性化学物质。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Applied Physics Letters 物理-物理：应用

CiteScore

6.40

自引率

10.00%

发文量

1821

审稿时长

1.6 months

期刊介绍： Applied Physics Letters (APL) features concise, up-to-date reports on significant new findings in applied physics. Emphasizing rapid dissemination of key data and new physical insights, APL offers prompt publication of new experimental and theoretical papers reporting applications of physics phenomena to all branches of science, engineering, and modern technology. In addition to regular articles, the journal also publishes invited Fast Track, Perspectives, and in-depth Editorials which report on cutting-edge areas in applied physics. APL Perspectives are forward-looking invited letters which highlight recent developments or discoveries. Emphasis is placed on very recent developments, potentially disruptive technologies, open questions and possible solutions. They also include a mini-roadmap detailing where the community should direct efforts in order for the phenomena to be viable for application and the challenges associated with meeting that performance threshold. Perspectives are characterized by personal viewpoints and opinions of recognized experts in the field. Fast Track articles are invited original research articles that report results that are particularly novel and important or provide a significant advancement in an emerging field. Because of the urgency and scientific importance of the work, the peer review process is accelerated. If, during the review process, it becomes apparent that the paper does not meet the Fast Track criterion, it is returned to a normal track.