Knowledge Bank

The infrared spectrum of $CD3F$ from 800 to $1220cm-1$ measured with resolution of about $0.0045cm-1$ has been analyzed using a model which treats the four fundamentals $\nu 2(A1),\nu 3(A1),\nu 5(E)$ and $\nu 6(E)$ simultaneously. 62 parameters were refined freely in a least squares fit of microwave data and over 4200 upper state energy levels with $J\le 40$ obtained from the infrared spectrum. The root mean square deviations of the infrared and microwave data were $0.706\times 10-3cm-1$ and $0.809\times 10-5cm-1$ respectively. Practically all strong and medium strong, and even the great majority of the weak transitions have been assigned in the infrared spectrum. Due to strong Coriolis, $\alpha ,r$ and higher order resonances, many normally ``forbidden'' infrared transitions have been observed which allows to determine the ground state constants $A0$ and $DK0$ with high accuracy. The energy levels in many of the observed submillimeter wave laser lines of $CD3F$ can now be identified.