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The Afterglow of Noble Gas Plasmas: Recombination and Excited States Formation

稀有气体等离子体的余辉：复合和激发态形成

基本信息

批准号：
224608509
负责人：
Dr. Tsanko Vaskov Tsankov
金额：
--
依托单位：
Institut für Experimentalphysik V: Lehrstuhl für Plasma- und Atomphysik
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2012
资助国家：
德国
起止时间：
2011-12-31 至 2015-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/224608509?language=en
关键词：
Afterglow Noble Gas Plasmas Recombination

项目摘要

In this project an extensive study of the afterglow of noble gas plasmas is proposed with a focus on the three-body recombination (TBR) process leading to the formation of the excited states. The aim is to get as complete as possible picture of the TBR process in the afterglow together with the excited states dynamics. For this purpose different aspects of the processes will be investigated. Measurements of the electron temperature and of the plasma density as well as of the excited states produced by the recombination are among the investigations to be performed. The results will be compared with numerical simulations and analytical estimations, leading to a complete self-consistent description of the processes in the afterglow. A microwave interferometer is applied for within the project for the measurements of the plasma density. For the measurement of low electron temperatures (in the range of the gas temperature) a retarding field energy analyzer will be used. The highly excited states, produced in the recombination process, will be measured by absorption spectroscopy. A fall-back plan would be to use a cavity ring-down spectroscopy. A collisional-radiative model for the low-pressure argon afterglow will be developed and used to analyze the intensity of certain argon lines. This will provide an independent measure of the electron density and possibly temperature, as well as of the excited states. The analysis of the recorded spectra (using a high-speed camera applied for in the project) will also serve as experimental evidence for certain aspects of the recombination process. For the experimental investigations a large plasma chamber is available. The chamber is operational and part of the diagnostic techniques to be used are available in the laboratory. This permits the immediate start of the work on the project. Pulsed low-pressure noble gas plasmas will be investigated. The large volume of the experimental chamber allows sustaining high density plasmas at low pressures and gives access to a high-density regime of the TBR where the plasma microfields are expected to play a role. This regime has not been investigated experimentally up to now. Expected importance of these investigations is to better clarify the role of the excited states for the afterglow and its potential industrial applications (e.g. “smart pulsing” based either on the Rydberg states maximum or metastable states maximum) and to provide experimental evidence for some fundamental aspects of the collisional-radiative recombination.

本项目对惰性气体等离子体的余辉进行了广泛的研究，重点研究了导致激发态形成的三体重组（TBR）过程。目的是获得尽可能完整的余辉中TBR过程的图像以及激发态动力学。为此目的，将研究过程的不同方面。电子温度和等离子体密度的测量以及由重组产生的激发态的测量都是要进行的研究。结果将与数值模拟和分析估计进行比较，从而对余辉过程进行完整的自洽描述。本项目采用微波干涉仪对等离子体密度进行测量。对于低电子温度（在气体温度范围内）的测量，将使用减速场能量分析仪。在复合过程中产生的高激发态将用吸收光谱法测量。一个备选方案是使用空腔衰荡光谱。建立了低压氩气余辉的碰撞辐射模型，并将其用于分析某些氩气谱线的强度。这将提供一个独立的测量电子密度和可能的温度，以及激发态。对记录光谱的分析（使用项目中申请的高速摄像机）也将作为重组过程某些方面的实验证据。为了进行实验研究，可以使用大型等离子体室。该室是可操作的，部分诊断技术可在实验室中使用。这允许立即开始项目上的工作。脉冲低压惰性气体等离子体将被研究。实验室的大体积允许在低压下维持高密度等离子体，并使TBR进入高密度状态，等离子体微场有望在其中发挥作用。到目前为止，还没有对这种状态进行实验研究。这些研究的预期重要性在于更好地阐明激发态对余辉的作用及其潜在的工业应用（例如基于里德伯态最大值或亚稳态最大值的“智能脉冲”），并为碰撞-辐射复合的一些基本方面提供实验证据。