Knowledge Bank

The $\nu 3$ and $\nu 7$ fundamental bands of hexafluoroethane were observed using two molecular beam techniques: pulsed slit-jet, diode laser spectroscopy, and continuous slit-jet. Fourier transform spectroscopy. The estimated rotational temperature of both beams is on the order 10 K. Preliminary analysis of the $\nu 3$ parallel band shows a regular progression of strong K = 0 transitions in the $P1$ $Q1$ and R-branches; other sub-bands are heavily perturbed. The band origin is at 1117.1098(5) $cm-1$, $B\prime \prime =0.06140(9)$ $cm-1$ and $B\prime =0.061641$ $cm-1$ for the prolate symmetric top molecule. The $\nu 4$ perpendicular band is centered at $1253cm-1$ and shows a congested series of and sub-branches. Spectra from both spectrometers and a detailed ro-vibrational analysis will be presented for both bands