Knowledge Bank

Recent work on the high-resolution spectroscopy of the stretching fundamental $\nu 3$ of $SF6$ includes the following: 1. A complete analysis of the Q branch accounts for some 3000 transitions between 947.6 and $948.3cm-1$. The $SF6$ transition pumped by the $CO2$ P(16) laser line has been identified as Q(38) $F10+E0+F20$. 2. The transition pumped by the $CO2$ P(22) laser line at $942.38cm-1$ has been identified as belonging to P(84) of $SF6$. 3. The Q branch and the low-J P- and R-branch lines of $\mathrm{<mrow\; data-mjx-texclass="ORD">33</mrow>}SF6(939.01$ $cm-1)$ have been measured and analysed. 4. From the laser diode spectra and other absorption measurements the transition dipole moment of $\nu 3$ of $SF6$ is estimated to be 0.41 $\pm 0.03$ Debye.