Other
Scientific paper
Jan 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994phdt........22d&link_type=abstract
Thesis (PH.D.)--UNIVERSITY OF MARYLAND COLLEGE PARK, 1994.Source: Dissertation Abstracts International, Volume: 55-10, Section:
Other
Scientific paper
Gaseous and condensed nitriles have been identified in the atmosphere of Titan, the large moon of Saturn, and are expected to be present on other outer planetary bodies as well. Accurate surface and atmospheric modeling of some of these outer planetary bodies depends on the optical properties of these condensed nitriles. Complex refractive indices, n and k, were determined by an iterative Kramers -Kronig analysis of the spectra of thin crystalline films of hydrogen cyanide (HCN), acetonitrile (CH_3 CN), propionitrile (CH_3CH _2CN), acrylonitrile (CH _2CHCN), cyanogen (C_2N _2), cyanoacetylene (HC_3 N), dicyanoacetylene (C_4N _2) and cyanopropyne (H_3 C_4N) at 35 K and 95 K in the mid infrared region (5000-450 cm^{ -1} and the far infrared region (450-80 cm ^{-1}. Integrated absorption coefficients for strong bands of these crystalline nitriles were also calculated. These values provide a valuable data base for atmospheric and surface modelers of outer planets. This data base along with infrared data from future space missions will be useful in the identification and quantification of crystalline nitriles in the atmosphere and on the surface of Titan as well as on other outer planetary bodies. Future space missions will provide at least two opportunities for exploring the infrared spectrum of Titan at high spectral resolution. The Infrared Space Observatory (ISO), will operate in Earth's orbit over an 18-month period obtaining high resolution infrared spectra of Titan covering the entire thermal spectral range. Cassini, a joint NASA/ESA mission, will make infrared observations of Titan during a period of several years.
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