Knowledge Bank

Previous $studies1,2$ of the infrared spectrum of HFCO have failed to locate $\upsilon 6$ the out of plane bending frequency whereas evidence from the electronic $spectrum3$ places this vibration near $1010cm-1$. High resolution $(FWHM\sim 0.005cm-1)$ spectra near $10\mu m$ have been obtained using a Bomem Fourier transform spectrometer. The region is dominated by $\upsilon 4$ (CF stretch) which gives rise to an AB hybrid band centered at $1064.9cm-1$ but there are no obvious features attributable to $\upsilon 6$ Detailed analysis shows that $\upsilon 4$ suffers from several small perturbations which are presumably due to $\upsilon 6$.