Measurements of Light Extinction by Single Aerosol Particles

被引：41

作者：

Walker, Jim S. ^{[1
]}

Carruthers, Antonia E. ^{[1
]}

Orr-Ewing, Andrew J. ^{[1
]}

Reid, Jonathan P. ^{[1
]}

机构：

[1] Univ Bristol, Sch Chem, Bristol BS8 1TS, Avon, England

来源：

JOURNAL OF PHYSICAL CHEMISTRY LETTERS | 2013年 / 4卷 / 10期

基金：

英国工程与自然科学研究理事会;

关键词：

CAVITY RING-DOWN; OPTICAL-PROPERTIES; REFRACTIVE-INDEX; SALT AEROSOLS; SCATTERING; SPECTROSCOPY; SPECTROMETER;

D O I：

10.1021/jz4008068

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

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.

引用

页码：1748 / 1752

页数：5

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