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Photoacoustics of single aerosol droplets immobilised by counter-propagating optical tweezers

机译:通过反传播光学镊子固定的单个气溶胶液滴的光声

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In this contribution we discuss the influence of relative humidity on photoacoustic measurements from both an experimental and theoretical perspective. We present a refined model of the photoacoustic (PA) signal that accounts for elevated particle temperatures and different levels of relative humidity. We use this new model together with the photoacoustic data collected with our photothermal single-particle spectrometer (PSPS) to retrieve the mass accommodation coefficients of water on organic aerosol particles. The single-particle nature of our experiments is achieved by employing counter-propagating tweezers. Furthermore, we investigate the influence of relative humidity on the eigenfrequency of the PA cell.
机译:在这一贡献中,我们讨论了相对湿度对实验和理论观点的光声测量的影响。我们介绍了一种精致的光声(PA)信号模型,其占升高的粒子温度和不同湿度水平。我们将该新模型与通过光热单粒子光谱仪(PSP)收集的光声数据一起使用,以检索有机气溶胶颗粒上的批量容纳系数。我们实验的单粒子性质是通过采用反传播镊子来实现的。此外,我们研究了相对湿度对PA细胞的特征频率的影响。

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