INFRARED DISPERSION MEASUREMENTS OF CARBON TETRAFLUORIDE∗TETRAFLUORIDE^{*}

1R. L. Kelly, R. Rollefson, and B. Schurin, Jour. Chem. Phys. 19, 1595 (1951). $^{*}$This work was supported in part by grants in aid from the Wisconsin Alumni Research Foundation. $^{\dagger}$Now at Geophysics Research Directorate, Air Force Cambridge Research Center.Author Institution: Department of Physics, University of Wisconsin“The refractive index of carbon tetrafluoride has been measured in the infrared region of the spectrum and the data used to investigate the distribution of charge associated with the molecular bond. The apparatus and method used to measure the infrared dispersion is essentially the same as that reported in previous $works.^{1}$ Monochromatic radiation is obtained from a Wadsworth type monochromator utilizing either NaCl or KBr optics. The radiation is passed through a hollow prism containing the gas being studied and the change in deviation produced by a change in pressure is taken as a measure of the refractive index. The measurements have been made between 1 and 20 microns and the absolute intensities of the two infrared active bands ($\nu_{s}, \nu_{4}$) determined from their contribution to the index. The results are: ${A}_{3}=(1.60\pm 0.04)\times 10^{14}{ cm }^{-1}/{sec}$ ${A}_{4}=(1.86\pm 0.17)\times 10^{12}{ cm }^{-1}/{sec}.$ The results have been interpreted with the aid of a Urey-Bradley type potential to yield alternate solutions for the dipole moment ($\mu$) of the C-F bond in the molecule and the variation of the moment with internuclear distance (${d}\mu/{dr}$). These are: \frac{{d}\mu}{{dr}}=7.71 { d/a } \frac{{d}\mu}{{dr}}=3.71 { d/A } or \mu=1.13{d} \mu=3.97{d}

INTEGRATED INTENSITY MEASUREMENTS FOR SOME NEAR INFRARED CO2CO_{2} BANDS.

Author Institution: Air Force Cambridge, Research Laboratories (CROI)The integrated band intensities for several of the $CO_{2}$ combination bands in the 1-2 micron region have been obtained using the Wilson-Wells-Penner-Weber self-broadening technique. Measurements were made for pressures ranging from 10-50 atmospheres, pathlengths from $1-100 cm$, and effective spectral bandwidths from $1-2 cm.^{-1}$ The reported values are: Integrated Band Intensities $(cm^{-2} atm^{-1}$ at $273^{\circ}K$) ""[FIGURE]"" $$\begin{array}{lll}2.0\,\mu & 4\,\nu_{2}+\nu_{3}& 0.218\\& \ \ \nu_{1}+2\ \nu_{2} + \nu_{3}& 1.005\\& 2\,\nu_{1}+\nu_{3}&0.334\\ 1.6\,\mu& \ \ \nu_{1} + 4\ \nu_{2}+ \nu_{3}& 0.0131\\ & 2\,\nu_{1}+2\,\nu_{2}+\nu_{3}&0.0132\\ 1.43\,\mu & 3\,\nu_{3}& 0.046\end{array}$

THE REFRACTIVE INDEX OF OZONE IN THE VISIBLE AND NEAR INFRARED SPECTRAL REGIONS

$^{1}$P. W. Langhoff and M. Karplus, J. Opt. Soc. Am. 59, 863 (1969).""Author Institution: Air Force Cambridge Research LaboratoriesAn asymmetric Michelson interferometer has been constructed in order to measure the refractive index of ozone. Optical dispersion measurements have been carried out between 3800 {\AA} and 2.5 microns with an absolute accuracy of one part in $10^{6}$. The results have been interpreted with a two term Sellmeier equation as well as the more recent procedure proposed by Langhoff and $Karplus.^{1}$ The extrapolation of the data to long wavelengths has been used to examine dielectric constant values reported in the literature