In many applications of the atmospheric pressure plasmas, the plasma is generated in chambers that enclose samples to be treated. In the case of plasma treatments of water or water-containing materials, the humidity in gaseous medium rises during the treatment, and this affects considerably the plasma generation of reactive oxygen and nitrogen species (RONS). In this study, Fourier transform infrared absorption spectroscopy is used to investigate the kinetics of reactive species generated by surface dielectric barrier (SDBD) micro-plasma in a small volume of atmospheric air (0.5 L) enclosed in a discharge chamber. The investigations were made for dry air (in absence of liquid water) and for humid air in presence of liquid water. The SDBD plasma contributes to desorption of water from the inner wall of the discharge chamber and enhances evaporation of liquid water, which increases air humidity and decreases the generation rates of reactive species. Kinetics of RONS generated in small samples of liquid water in contact with discharge medium is investigated by ex situ UV absorption spectroscopy measurements of plasma treated water.

中文翻译：

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表面介电势垒放电微等离子体在封闭大气空气和水样的小室中产生的分子种类

在大气压等离子体的许多应用中，等离子体是在封闭待处理样品的腔室中产生的。在对水或含水材料进行等离子体处理的情况下，处理过程中气态介质中的湿度会升高，这会显着影响活性氧和氮物质 (RONS) 的等离子体生成。在这项研究中，傅里叶变换红外吸收光谱用于研究由表面介电势垒 (SDBD) 微等离子体在封闭在放电室中的少量大气空气 (0.5 L) 中产生的反应物种的动力学。对干燥空气（不存在液态水）和存在液态水的潮湿空气进行了研究。SDBD 等离子体有助于从放电室的内壁解吸水并增强液态水的蒸发，从而增加空气湿度并降低活性物质的生成率。通过等离子体处理水的非原位紫外吸收光谱测量，研究了在与放电介质接触的液态水的小样本中产生的 RONS 的动力学。