Knowledge Bank

The vapor-phase far-infrared and low-frequency Raman spectra of cyclohexene have been recorded and analyzed. The observed spectra occur primarily in three regions. The far-infrared spectrum in the $155-170cm-1$ region shows a series of bands arising from the ring bending motion, whereas the Raman bands resulting from the ring twisting occur near $275cm-1$. In addition, a number of difference bands between 90 and $120cm-1$ were also observed. Both kinetic energy expansion calculations and two-dimensional potential energy surface calculations have been carried out. The results will be compared to those previously reported of similar molecules.