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Author Klaboe, P. ♦ Nielsen, J. R.
Sponsorship USDOE
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword METALS, CERAMICS, AND MATERIALS ♦ CESIUM BROMIDES ♦ CRYSTALS ♦ ENTHALPY ♦ FLUORINATED HYDROCARBONS ♦ GASES ♦ INFRARED RADIATION ♦ ISOMERS ♦ LIQUIDS ♦ LITHIUM FLUORIDES ♦ LOW TEMPERATURE ♦ MEASURED VALUES ♦ OPTICAL SYSTEMS ♦ PHOTOGRAPHY ♦ POLARIZATION ♦ RAMAN EFFECT ♦ SODIUM CHLORIDES ♦ SOLIDS ♦ SPECTRA ♦ SPECTROMETERS ♦ TEMPERATURE ♦ THERMODYNAMICS ♦ VIBRATIONS
Abstract The infrared absorption specta of gaseoils CHF/sub 2/-CHF/sub 2/ at five temperatures between 30 and 170 deg C and of the crystalline solid at -- 170 deg C were obtained with a PerkinElmer double-pass spectrometer equipped with CsBr, NaCl, and LiF prisms. The Raman spectrum of the liquid at 20, --25, and -- 80 deg C was photographed with a 3-prism glass spectrograph of reciprocal linear dispersion 15 A/ mm at 4358 A, and polarization measurements were made. In the gaseous and liquid states the compound exists as a mixture of two rotational isomers of symmetries C/sub 2h/ and C/sub 2/, respectively, the former (trans) being the more stable. In the crystalline state only the trans configuation was present. A value of 1160 plus or minus 100 cal/mole was found for the enthalpy difference DELTA H/sup 0/ in the gas. In the liquid, DELTA H/sup 0/ was much smaller. With some uncertainties, the vibrational fundamentals were assigned for each isomer. (See also NSA Vol. II abstact No. 9243.) (auth)
ISSN 00219606
Educational Use Research
Learning Resource Type Article
Publisher Date 1960-03-01
Publisher Department Univ. of Oklahoma, Norman
Journal Journal of Chemical Physics
Volume Number 32
Organization Univ. of Oklahoma, Norman


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