Knowledge Bank

In a current research program, which consists of an extensive calculation of the infrared transmission of gaseous $CO2$ for small frequency intervals covering the range from 500 to $10,000cm-1$, it is necessary to obtain accurate values for the energy of a large number of vibrational levels for at least eight isotopic species of this molecule. A digital computer calculation of these vibrational energies has been carried out. It is based on the extensive analysis of the $CO2$ molecule by $Courtoy.1$ For the eigenvalue calculation associated with the occurrence of Fermi resonance between levels, a very accurate computer program was obtained. A description of the calculational methods and the extensive results will be presented.