Method to measure refractive indices of small nonspherical particles: Application to black carbon particles
Method to measure refractive indices of small nonspherical particles: Application to black carbon particles
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DOI：
10.1016/j.jaerosci.2010.02.013
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发表时间：
2010-05-01
影响因子：
4.5
通讯作者：
Nakamura, Shin-ichi
中科院分区：
文献类型：
--
作者：
Moteki, Nobuhiro;Kondo, Yutaka;Nakamura, Shin-ichi
提出了一种同时测量非球形小粒子体积和光散射截面的方法，测量非球形小粒子的折射率m。与传统方法相比，该方法可以抑制由于未知颗粒形状而引起的不确定性。作为该方法的演示，实验室实验使用气溶胶粒子质量分析仪（APM）和单粒子烟尘光度计（SP2）已进行，以确定在1064 nm波长的七种类型的商业炭黑颗粒和环境烟尘的折射率。在七个商业炭黑样品中测量的垂直条（m（2）-1）/（m（2）+2）垂直条值的差异与通过透射电子显微镜鉴定的它们的晶体结构的差异一致。测定东京市区环境煤烟粒子的复折射率m =（n，k）为m =（2.26 +/- 0.13，1.26 +/- 0.13）。(C)2010爱思唯尔有限公司版权所有。
We demonstrate a new method to measure refractive indices m of small nonspherical particles by simultaneous measurement of particle volume and light-scattering cross section. In contrast to traditional methods, this method can suppress uncertainties due to unknown particle shape. As demonstration of the method, laboratory experiments using an aerosol particle mass analyzer (APM) and single-particle soot photometer (SP2) have been conducted to determine the refractive indices of seven types of commercial black carbon particles and ambient soot at 1064 nm wavelength. Difference in measured vertical bar(m(2) - 1)/(m(2) + 2)vertical bar values among the seven commercial black carbon samples is consistent with the difference in their crystalline structures identified by a transmission electron microscope. The complex refractive index m =(n, k) of ambient soot particles in Tokyo urban area was determined to be m = (2.26 +/- 0.13, 1.26 +/- 0.13). (C) 2010 Elsevier Ltd. All rights reserved.