Infrared band extinctions and complex refractive indices of crystalline C 2H 2 and C 4H 2
Abstract
Infrared absorption intensities of thin films of crystalline C 2H 2 and C 4H 2 at 70°K are reported for the characteristic features of these materials in the thermal infrared region (2-50 μm). In order to determine the complex refractive indices ( n and k) the reflection at the interfaces and the true absorption by the film deposited on a nonabsorbing substrate are separated by analyzing the ratio of transmission spectra for two sample thicknesses. This results in a significant simplification of the iteration process required to obtain n and k by the Kramers-Kronig analysis of the extinction data. The laboratory-determined values of n and k reproduce the observed transmission for a given sample thickness to within ±5% in most cases.
- Publication:
-
Icarus
- Pub Date:
- March 1988
- DOI:
- 10.1016/0019-1035(88)90062-0
- Bibcode:
- 1988Icar...73..527K
- Keywords:
-
- Acetylene;
- Infrared Absorption;
- Kramers-Kronig Formula;
- Planetary Radiation;
- Thermal Emission;
- Titan;
- Infrared Spectra;
- Iris Satellites;
- Low Temperature;
- Natural Satellites;
- Vapor Phases;
- Vibrational Spectra