Knowledge Bank

Using a tunable diode laser we have obtained the vibration-rotation spectrum of the $\nu 4$ bending fundamental of $CF4$ at 16-$\mu$m. From a least-square analysis of the frequencies for several hundred lines and a full diagonalization of the Hamiltonian, values for both the scalar and tensor constant have been determined. In addition, we have evaluated $B4$, the Coriolis constant $\zeta 4$, and the vibration-rotation operator $\delta$. Data were obtained for the three isotopic molecules: $\mathrm{<mrow\; data-mjx-texclass="ORD">12</mrow>}CF4,13CF4$, and $\mathrm{<mrow\; data-mjx-texclass="ORD">14</mrow>}CF4$; and the spectroscopic constants determined for each. The values obtained are compared with those evaluated from previous work at lower resolution by Jones et al. (1).