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A laser induced fluorescence technique for determining the pH of water droplets and probing uptake dynamics

机译:激光诱导荧光技术,用于确定水滴的pH值并探测吸收动力学

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摘要

A new experimental approach is demonstrated for probing the uptake dynamics of aerosols. By seeding liquid aerosol droplets with a pH sensitive dye, the laser induced fluorescence (LIF) spectrum can be used to unambiguously and directly determine the droplet pH. Droplets larger than 15 mm in radius are studied in this work. Measurements show that for these size droplets, the fluorescence spectrum is independent of droplet size and conforms to that obtained in bulk phase measurements. Fluorescence lifetime measurements support the conclusion that the measurements are inherently bulk phase in character. By using cavity enhanced Raman scattering, the size of the droplets being sampled is accurately determined. The velocity of the droplets is determined from elastic light scattering measurements. In a droplet train apparatus in which the gas phase composition can be accurately controlled, the LIF technique is used to investigate the uptake of ammonia by acidic water droplets with varying ammonia partial pressure and exposure time. [References: 39]
机译:一种新的实验方法被证明可以探测气溶胶的吸收动力学。通过用pH敏感染料在液体气雾滴上播种,可以使用激光诱导荧光(LIF)光谱明确,直接地确定液滴的pH。这项工作研究了半径大于15毫米的液滴。测量表明,对于这些尺寸的液滴,荧光光谱与液滴尺寸无关,并且与在体相测量中获得的光谱一致。荧光寿命测量结果支持这样的结论,即测量结果本质上是本体相。通过使用腔增强拉曼散射,可以精确确定所采样液滴的大小。液滴的速度由弹性光散射测量确定。在其中可以精确控制气相组成的液滴列装置中,LIF技术用于研究酸性分子在氨分压和暴露时间变化的情况下对氨的吸收。 [参考:39]

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