Scattergood T W
SUNY at Stony Brook and NASA Ames Research Center, USA.
Adv Space Res. 1995 Mar;15(3):313-6. doi: 10.1016/s0273-1177(99)80102-1.
The atmosphere of Titan is known to contain aerosols, as evidenced by the Voyager observations of at least three haze layers. Such aerosols can have significant effects on the reflection spectrum of Titan and on the chemistry and thermal structure of its atmosphere. To investigate some of these effects, laboratory simulations of the chemistry of Titan's atmosphere have been done. The results of these studies show that photolysis of acetylene, ethylene, and hydrogen cyanide, known constituents of Titan's atmosphere, yields sub-micron sized spheres, with mean diameters ranging from 0.4 to 0.8 microns, depending on the pressures of the reactant gases. Most of the spheres are contained in near-linear aggregates. The formation of the aggregates is consistent with models of Titan's reflection spectrum and polarization, which are best fit with non-spherical particles. At room temperature, the particles are very sticky, but their properties at low temperatures on Titan are presently not known.
已知土卫六的大气中含有气溶胶，“旅行者号”对至少三层霾层的观测证明了这一点。这种气溶胶会对土卫六的反射光谱及其大气的化学和热结构产生重大影响。为了研究其中的一些影响，已经对土卫六大气的化学过程进行了实验室模拟。这些研究结果表明，土卫六大气中已知成分乙炔、乙烯和氰化氢的光解会产生亚微米级的球体，其平均直径在0.4至0.8微米之间，具体取决于反应气体的压力。大多数球体包含在近似线性的聚集体中。聚集体的形成与土卫六反射光谱和偏振模型一致，这些模型与非球形粒子最为匹配。在室温下，这些粒子非常黏，但它们在土卫六低温环境下的特性目前尚不清楚。
