MOLECULAR CONSTANTS OF CARBON DIOXIDE.

Mr. A. W. Mantz has been deputed under the Professional Advancement Program of the U.S. Air Force. Acknowledgement is made to the part support extended this project by the Air Force Cambridge Research Laboratories, Office of Aerospace Research.Author Institution: Laboratory of Molecular Spectroscopy and Infrared Studies, Department of Physics, The Ohio State UniversityA set of molecular constants, i.e. vibrational constants $\omega_{*****}, X_{******}, Y_{*****}$, vibration-rotation coupling constants $\alpha_{s},\gamma_{*****},q_{0},q_{v}$ and Fermi interaction constants, $\lambda_{*****}$ and $\lambda_{J}$, were calculated for carbon dioxide, $^{12}C^{16}O_{2}$, using a computer program which employs a generalized version of the technique for least squares adjustment of the quadratic force field. The secular equations for 37 vibrational polyads and 47 vibrational-rotational polyads (a total of 156 levels) were solved simultaneously for a set of molecular constants which satisfy the known theoretical relations for second-order constants. With properly weighted experimental data the molecular constants calculated for carbon dioxide reproduce the data to within their quoted experimental uncertainty the standard deviation being $\pm0.019 cm^{-1}$