Infrared optical properties of solid monomethyl hydrazine, N_2O_4, and N_2H_4 at cryogenic temperatures
Abstract
To account for and identify the effects of cryocontamination, the infrared complex refractive-index values of cryofilms of monomethyl hydrazine (MMH), hydrazine (N2H4), and nitrogen tetroxide (N2O4) were determined for the 500-3700 per cm wave-number range. Techniques similar to those described by Wood and Roux (1982) are used for thin H2O, CO2, and NH3 condensed-gas films. Thin MMH, N2O4, and N2H4 films from 0.25 to 9.0 micron thick were formed on a germanium substrate at 20 and 80 K in vacuum, and the infrared transmittances were measured by using a Fourier-transform spectrometer. Values of the optical properties (n, k) were derived from the experimental transmittance data by using a nonlinear least-squares method with a thin-film-transmittance analytical model. These optical constants were compared with results obtained with the subtractive Kramers-Kronig technique. These optical properties are important for predicting the performance of contaminated optical components.
- Publication:
-
Journal of the Optical Society of America (1917-1983)
- Pub Date:
- September 1983
- DOI:
- 10.1364/JOSA.73.001181
- Bibcode:
- 1983JOSA...73.1181R
- Keywords:
-
- Cryogenics;
- Hydrazines;
- Infrared Spectra;
- Nitrogen Tetroxide;
- Optical Measurement;
- Optical Properties;
- Germanium;
- Infrared Interferometers;
- Methylhydrazine;
- Refractivity;
- Thin Films;
- Transmittance;
- Optics