Knowledge Bank

We have used the microwave modulation sidebands $CO2$ laser source for sub-Doppler spectroscopy of $PF5$ in the $10\mu m$ $region,1,2$ where a great number of spectral lines have been observed corresponding to the fundamental and many hot bands of the $\nu 3$ transition. Under high resolution $(\Delta \nu \sim 50kHz)$ many of the spectral lines for the fundamental band, as well as various hot bands, are split by about $500kHz\sim 1MHz$. For most cases the two components of the split lines have about equal intensity. The relation of the observed splitting with the possible pseudorotation of $PF5\mathrm{<mrow\; data-mjx-texclass="ORD">3</mrow>}$ is being investigated.