Measurements of Light Extinction by Single Aerosol Particles
Measurements of Light Extinction by Single Aerosol Particles
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DOI：
10.1021/jz4008068
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发表时间：
2013-05-16
影响因子：
5.7
通讯作者：
Reid, Jonathan P.
中科院分区：
文献类型：
--
作者：
Walker, Jim S.;Carruthers, Antonia E.;Reid, Jonathan P.
贝塞尔光束光阱与连续波腔衰荡光谱相结合，测量单个气溶胶粒子的消光截面。类似于1 μ m大小的粒子可以被无限捕获，并且可以研究改变大小或折射率的过程。由粒子引起的测量光消取决于粒子在腔中的位置，从而可以在没有明显扰动的情况下精确测量高精细度光学腔的模式结构。氯化钠液滴消光效率随相对湿度的变化与Mie散射理论的预测相吻合。
A Bessel beam optical trap is combined with continuous wave cavity ringdown spectroscopy to measure the extinction cross section of individual aerosol particles. Particles, similar to 1 mu m in size, can be captured indefinitely and processes that transform size or refractive index studied. The measured light extinction induced by the particle is shown to depend on the position of the particle in the cavity, allowing accurate measurements of the mode structure of a high finesse optical cavity without significant perturbation. The variation in extinction efficiency of a sodium chloride droplet with relative humidity is shown to agree well with predictions from Mie scattering theory.