瑞利-德拜-甘斯理论用于分形聚集体光散射的实验测试。

Experimental test of the Rayleigh-Debye-Gans theory for light scattering by fractal aggregates.

作者信息

Wang Genmiao, Sorensen Christopher M

机构信息

Department of Physics, Kansas State University, Manhattan 66506-2601, USA.

出版信息

Appl Opt. 2002 Aug 1;41(22):4645-51. doi: 10.1364/ao.41.004645.

DOI:10.1364/ao.41.004645

PMID:12153098

Abstract

Calibrated measurements of optical (lambda = 488-nm) scattering cross sections, in the form of Rayleigh ratios, are presented for two fractal aggregate aerosols. The aggregates have radii of gyration of approximately 280 nm, fractal dimensions of approximately 1.75, and monomer sizes of approximately 20 nm with approximately 150 monomers per cluster. One aerosol was composed of vitreous SiO2 with a refractive index of 1.46, the other of anatase TiO2 with a refractive index of 2.61. We found good agreement with the Rayleigh-Debye-Gans prediction for the scattering cross section of fractal aggregates.

摘要

给出了两种分形聚集体气溶胶以瑞利比形式表示的光学（波长 = 488 纳米）散射截面的校准测量结果。这些聚集体的回转半径约为 280 纳米，分形维数约为 1.75，单体尺寸约为 20 纳米，每个聚集体约有 150 个单体。一种气溶胶由折射率为 1.46 的玻璃态 SiO₂ 组成，另一种由折射率为 2.61 的锐钛矿型 TiO₂ 组成。我们发现分形聚集体散射截面的测量结果与瑞利 - 德拜 - 甘斯预测结果吻合良好。