Mishchenko Michael I, Dlugach Janna M
NASA Goddard Institute for Space Studies, 2880 Broadway, New York, NY 10025, USA.
Main Astronomical Observatory of the National Academy of Sciences of Ukraine, 27 Zabolotny Str., 03680, Kyiv, Ukraine.
J Quant Spectrosc Radiat Transf. 2017 Oct;200:244-248. doi: 10.1016/j.jqsrt.2017.06.021. Epub 2017 Jun 21.
We use the superposition -matrix method to compare the far-field scattering matrices generated by spheroidal and spherical volumes of discrete random medium having the same volume and populated by identical spherical particles. Our results fully confirm the robustness of the previously identified coherent and diffuse scattering regimes and associated optical phenomena exhibited by spherical particulate volumes and support their explanation in terms of the interference phenomenon coupled with the order-of-scattering expansion of the far-field Foldy equations. We also show that increasing nonsphericity of particulate volumes causes discernible (albeit less pronounced) optical effects in forward and backscattering directions and explain them in terms of the same interference/multiple-scattering phenomenon.
我们使用叠加矩阵法来比较由具有相同体积且填充有相同球形颗粒的离散随机介质的椭球体和球体所产生的远场散射矩阵。我们的结果充分证实了先前确定的球形颗粒体积所表现出的相干和漫散射 regime 以及相关光学现象的稳健性，并支持根据与远场 Foldy 方程的散射阶数展开相结合的干涉现象对其进行解释。我们还表明，颗粒体积非球形度的增加会在向前和向后散射方向上产生明显（尽管不太显著）的光学效应，并根据相同的干涉/多次散射现象对其进行解释。
