Measurements of Light Extinction by Single Aerosol Particles
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- 作者：Jim S. Walker ; Antonia E. Carruthers ; Andrew J. Orr-Ewing ; Jonathan P. Reid
- 刊名：The Journal of Physical Chemistry Letters
- 出版年：2013
- 出版时间：May 16, 2013
- 年：2013
- 卷：4
- 期：10
- 页码：1748-1752
- 全文大小：271K
- 年卷期：v.4,no.10(May 16, 2013)
- ISSN：1948-7185
文摘
A Bessel beam optical trap is combined with continuous wave cavity ringdown spectroscopy to measure the extinction cross section of individual aerosol particles. Particles, 1 渭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.