低温等离子体 (LTP) 环境电离源的表征使用临时分辨率单色成像光谱学
George C-Y Chan1,2, Carsten Engelhard1,3, Joshua S Wiley4
1Department of Chemistry, Indiana University, Bloomington, IN, USA.
Applied spectroscopy
|August 21, 2023
概括
这项研究使用2D成像可视化低温等离子体 (LTP) 喷射物种,揭示了瞬态等离子体子弹的行为和与表面的相互作用. 这些发现增强了对LTP质谱学 (MS) 中分析离子采样改进的理解.
科学领域:
- 等离子体物理学的物理学
- 质谱测量质量谱测量
- 光学光谱学是指光学光谱学.
背景情况:
- 低温等离子体 (LTP) 探针在环境脱离-离子化质谱法 (MS) 中很常见.
- 虽然LTP探针对MS的特征很好,但光学光谱学研究较少见.
- 了解LTP血射流动力学对于优化MS性能至关重要.
研究的目的:
- 使用二维 (2D) 成像在LTP等离子喷射中可视化关键物种.
- 研究LTP发射的时间和空间动态,包括短暂的行为.
- 为了研究LTP探头与样品基板和外部电气元件的相互作用.
主要方法:
- 记录了特定波长的N2+,He I和N2的LTP排放的2D稳态图像.
- 利用时间分辨率的2D成像与200 ns检测门来映射短暂的等离子体物种.
- 与质谱学数据相关联的光学发射光谱和分析的LTP操作参数效应.
主要成果:
- 在He I,N2+和N2排放中观察到短暂的'血子弹'行为,持续微秒.
- 在N2+和He I排放之间发现了高的空间和时间相关性.
- 证明接地针延长了等离子喷射的寿命,并影响了放电动力学.
结论:
- 具有时间和空间分辨率的成像提供了对LTP等离子体喷射过程的关键见解.
- 了解这些动态,包括短暂的行为和相互作用,是改善LTP-MS中分析离子采样的关键.
- 光学光谱学补充了MS特性,以更全面地了解LTP源.
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