Polarization properties of spherical interstellar grains on light scattering
Polarization properties of spherical interstellar grains on light scattering
复制标题
球形星际颗粒光散射的偏振特性
DOI：
10.1007/bf00644183
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发表时间：
1986
期刊：
影响因子：
--
通讯作者：
M. Seki
中科院分区：
文献类型：
--
作者：
M. Matsumura;M. Seki
在Mie理论的基础上，计算了由冰、硅酸盐和石墨组成的球形星际颗粒在紫外、可见光和近红外波段的偏振微分截面和偏振效率。就由于散射引起的偏振而言，这些颗粒在0<x ≤ 1时以瑞利散射的形式散射光，其中x是无量纲尺寸参数。当x = 1时，偏振效率强烈依赖于颗粒材料折射率的虚部（m″）的值：对于m ″ = 0.1的介质颗粒或石墨颗粒等吸收球，在红外波段，偏振效率在x = 1时达到最大值，当x接近0时，偏振效率下降到零。
On the basis of the Mie theory, the differential cross-section for polarization and the polarization efficiency are calculated for some spherical interstellar grains consisting of ice, silicate, or graphite in the ultraviolet, optical, and near infrared wavelengths. As far as the polarization due to scattering is concerned, these particles scatter light as Rayleigh scattering for 0<x≲1, wherexis the dimensionless size parameter. The polarization efficienties depend strongly on the value of the imaginary part (m″) of the refractive index of grain material whenx≪1: the efficiency takes a maximum value atx≃1 and decreases to zero asxapproaches zero for the absorbing sphere such as the dielectric particle withm″≃0.1 or the graphite grain in the infrared wavelengths.