Emission spectroscopy of atmospheric pressure plasmas for bio-medical and environmental applications
Emission spectroscopy of atmospheric pressure plasmas for bio-medical and environmental applications
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DOI：
10.1016/j.jms.2007.03.001
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发表时间：
2007-06-01
影响因子：
1.4
通讯作者：
Morvova, M.
中科院分区：
文献类型：
--
作者：
Machala, Z.;Janda, M.;Morvova, M.
本文介绍了中分辨率UV-Vis光学发射光谱用于诊断与生物、医疗和环境应用有关的大气、空气和氮等离子体的几种方法。研究了直流放电(流光电晕、瞬时火花和辉光放电)、多孔陶瓷交流微放电和微波等离子体产生的等离子体。鉴定了分子(OH，NO，CN)和原子(H，O，N)自由基以及其他活性物种，如N-2(C，B，A)，N-2(+)(B)。发射光谱的组成使我们对正在进行的等离子体化学有了深入的了解。通过模拟光谱与实验数据的拟合，估算了转动温度，即气体温度和振动温度。流光电晕、瞬时火花和微放电产生冷的、强烈的非平衡等离子体(300-550K)，辉光放电等离子体较热，但不平衡(1900K)，微波等离子体非常热和热(类似于3000-4000K)。在化学平衡和玻尔兹曼分布(9800K，3×10(16)cm-3)的假设下，估算了辉光放电中的电子激发温度和OH自由基浓度。光学发射还提供了辉光放电的活动等离子体尺寸的测量，并能够计算其电子数密度(1012 CM-3)。(C)2007 Elsevier Inc.保留所有权利。
The paper demonstrates several ways of use of the UV-vis optical emission spectroscopy of medium resolution for the diagnostics of atmospheric pressure air and nitrogen plasmas relevant to bio-medical and environmental applications. Plasmas generated by DC discharges (streamer corona, transient spark, and glow discharge), AC microdischarges in porous ceramics, and microwave plasma were investigated. Molecular (OH, NO, CN) and atomic (H, O, N) radicals, and other active species, e.g. N-2 (C, B, A), N-2(+) (B), were identified. The composition of the emission spectra gives insight in the ongoing plasma chemistry. Rotational, i.e. gas, and vibrational temperatures were evaluated by fitting experimental with simulated spectra. Streamer corona, transient spark and microdischarges generate cold, strongly non-equilibrium plasmas (300-550 K), glow discharge plasma is hotter, yet non-equilibrium (1900 K), and microwave plasma is very hot and thermal (similar to 3000-4000 K). Electronic excitation temperature and OH radical concentration were estimated in the glow discharge assuming the chemical equilibrium and Boltzmann distribution (9800 K, 3 x 10(16) CM-3). Optical emission also provided the measurement of the active plasma size of the glow discharge, and enabled calculating its electron number density (1 012 CM-3). (C) 2007 Elsevier Inc. All rights reserved.