Ultraviolet optical constants of water and ammonia ices
Ultraviolet optical constants of water and ammonia ices
复制标题
水和氨冰的紫外光学常数
DOI：
10.1364/josa.65.000919
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发表时间：
1975
期刊：
影响因子：
--
通讯作者：
R. Anderson
中科院分区：
文献类型：
--
作者：
E. V. Browell;R. Anderson
在1610和3200 A之间测量了无定形和六方水冰的真实的折射率，在1925和3200 A之间测量了无定形氨冰的折射率。这些冰的吸收系数的上限是根据水冰在1475 A下和无定形氨冰在1760 A下的吸收系数测量值确定的。将非晶冰从气相沉积到冷却至77 K的镀金蓝宝石衬底上。在155 K时，通过沉积形成了半球形水冰。用单色光以两个入射角照射冰膜。干涉条纹周期，这是观察到的膜厚度以恒定速率增加，用于确定薄膜的真实的折射率。随着膜厚度的增加，条纹振幅的阻尼被用来建立消光系数。
Real refractive indices for amorphous and hexagonal water ices were measured between 1610 and 3200 A, and for amorphous ammonia ice between 1925 and 3200 A. Upper limits on the absorption coefficients for these ices were established from extinction-coefficient measurements made at 1475 A for water ices and at 1760 A for amorphous ammonia ice. Amorphous ices were deposited from the gaseous phase onto a gold-coated sapphire substrate that was cooled to 77 K. Hexagonal water ice was formed by deposition at 155 K. The ice films were illuminated with monochromatic light at two angles of incidence. Interference-fringe periods, which were observed as the film thickness increased at a constant rate, were used to determine the real refractive index of the film. Damping of the fringe amplitude, as the film thickness increased, was used to establish the extinction coefficients.