Elucidation of excitation mechanisms which lead to homogeneous and filamentary modes of a dielectric barrier driven plasma-jet

阐明导致介电势垒驱动等离子体射流的均匀和丝状模式的激发机制

• 批准号: 262732688
• 负责人: Privatdozent Dr. Joachim Franzke
• 金额: --
• 依托单位: Leibniz-Institut für Analytische Wissenschaften -ISAS- e.V.
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2015
• 资助国家: 德国
• 起止时间: 2014-12-31 至 2017-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/262732688?language=en
• 关键词: Elucidation; excitation; mechanisms; lead; homogeneous

In recent years dielectric barrier discharges were applied both for Ambient Air Ionisation and for soft ionization of organic molecules. Most of the applied discharges differ in the homogeneous and filamentary operation mode. In the case of the operation in a homogeneous mode the ionization efficiency is 1000 times higher than in the case of the filamentary one. Therefore, in this research project the excitation mechanisms, which lead to different operation modes, should be elucidated in order to increase the effectivity of the ionisation.In the first step, the influence of the air, which is around the plasma-jet, will be investigated by a comparison with He as surrounding gas both in the homogeneous and the filamentary mode with the help of a spatially resolved measurement. After the ignition of a plasma the divergence of the gas-flow which leaves the capillary will be changed. When the Divergence is also changed when the operation mode is changed from homogeneous to filamentary this might be an explanation for the decrease of the Ionisation efficiency.It can be expected that in an homogeneous He plasma the majority of ions consists of N2+ ions whereas in a filamentary plasma also or even more He2+ as well as He+ ions will be present. In a He plasma the existence of He2+ as well as He+ is hard or even not possible to detect by optical spectroscopy and by mass spectrometry it cannot be measured spatially dependent. Therefore, with the help of a model system consisting of Ar and low concentrations of ammonia and Fluor the assumption will be inspected.Furthermore, with the help of time-resolved measurements it will be investigated if the plasma-jet, as often stated, is really an afterglow or if both plasmas, the electrode plasma and the plasma-jet can be seen as two coupled plasmas. This will be investigated for different polarisations and in dependence on the applied voltage.

近年来，将介电屏障放电用于环境空气电离和有机分子的软电离。大多数应用放电在均质和丝状操作模式下有所不同。在均匀模式下操作的情况下，电离效率比丝状效率高1000倍。因此，在这项研究项目中，应阐明导致不同操作模式的激发机制，以提高电离的有效性。在第一步中，将通过与He作为同质和纤维模式与既有型号的均值测量值的气体均与周围的气体进行比较来调查空气的影响。血浆点火后，将更改离开毛细管的气流的差异。 当操作模式从均匀变为丝状时也更改了分歧时，这可能是降低电离效率的解释。可以预期，在同质性的等离子中，大多数离子n2+离子的大多数是在丝状等离子体中，而在丝状等离子中也是更多的He2+ he2+ he2+ ser+ ser+他的成员。在血浆中，He2+以及He+的存在很难，甚至无法通过光谱检测，并且通过质谱法检测到不能在空间上依赖于它。因此，在由AR和低浓度的氨和荧光组成的模型系统的帮助下，将检查假设。Furthermore在时间分解测量的帮助下，如果通常说的等离子射流确实是一种等离程度，或者是等离子体，或者是电子dode dode plassmam，则可以将其视为电子等等化等等离子和等离子和等离子和等离子和等离子的两个cc。这将研究不同的极性化，并依赖于施加的电压。

项目成果

Capillary Dielectric Barrier Discharge: Transition from Soft Ionization to Dissociative Plasma.

• DOI: 10.1021/acs.analchem.5b04605
• 发表时间: 2016-04
• 期刊: Analytical chemistry
• 影响因子: 7.4
• 作者: F. Klute;A. Michels;A. Schütz;C. Vadla;V. Horvatić;J. Franzke

Characterization of dielectric barrier discharges for analytical chemistry

• DOI: 10.1088/1361-6463/aace24
• 发表时间: 2018-07
• 期刊: Journal of Physics D: Applied Physics
• 作者: F. Klute;A. Schütz;Sebastian Brandt;S. Burhenn;Pascal Vogel;J. Franzke

An experimental study on the influence of trace impurities on ionization of atmospheric noble gas dielectric barrier discharges.

• DOI: 10.1039/c6an01352j
• 发表时间: 2016-10
• 期刊: The Analyst
• 作者: F. Klute;A. Schütz;A. Michels;C. Vadla;D. Veẑa;V. Horvatić;J. Franzke

Soft Argon-Propane Dielectric Barrier Discharge Ionization.

• DOI: 10.1021/acs.analchem.7b05390
• 发表时间: 2018-02
• 期刊: Analytical chemistry
• 影响因子: 7.4
• 作者: A. Schütz;Felipe J. Lara-Ortega;F. Klute;Sebastian Brandt;M. Schilling;A. Michels;D. Veẑa;V. Horvatić;J. García-Reyes;J. Franzke

Tuning Soft Ionization Strength for Organic Mass Spectrometry.

• DOI: 10.1021/acs.analchem.6b01131
• 发表时间: 2016-05
• 期刊: Analytical chemistry
• 影响因子: 7.4
• 作者: A. Schütz;F. Klute;Sebastian Brandt;Sascha Liedtke;G. Jestel;J. Franzke